Fix a typo in the enable inf support script

[chienhanlin]

Summary

This PR removes a typo use from the enable-ecs-agent-inferentia-support.sh.

P.S. The associated PR is #149.

Implementation details

Remove a typo use from enable-ecs-agent-inferentia-support.sh.

Testing

1. Build a new AL2023 NEU with the updated script, and confirm Neuron devices and with Neuron tools tests both pass.

==> amazon-ebs.al2023neu: + [[ al2023neu == \a\l\2\i\n\f ]]
==> amazon-ebs.al2023neu: + sudo yum install -y aws-neuronx-tools
    amazon-ebs.al2023neu: Last metadata expiration check: 0:02:18 ago on Tue Oct 10 17:02:47 2023.
    amazon-ebs.al2023neu: Dependencies resolved.
    amazon-ebs.al2023neu: ================================================================================
    amazon-ebs.al2023neu:  Package                  Architecture  Version             Repository     Size
    amazon-ebs.al2023neu: ================================================================================
    amazon-ebs.al2023neu: Installing:
    amazon-ebs.al2023neu:  aws-neuronx-tools        x86_64        2.14.6.0-1          neuron         28 M
    amazon-ebs.al2023neu:
    amazon-ebs.al2023neu: Transaction Summary
    amazon-ebs.al2023neu: ================================================================================
    amazon-ebs.al2023neu: Install  1 Package
    amazon-ebs.al2023neu:
    amazon-ebs.al2023neu: Total download size: 28 M
    amazon-ebs.al2023neu: Installed size: 97 M
    amazon-ebs.al2023neu: Downloading Packages:
    amazon-ebs.al2023neu: aws-neuronx-tools-2.14.6.0.rpm                   15 MB/s |  28 MB     00:01
    amazon-ebs.al2023neu: --------------------------------------------------------------------------------
    amazon-ebs.al2023neu: Total                                            15 MB/s |  28 MB     00:01
    amazon-ebs.al2023neu: Running transaction check
    amazon-ebs.al2023neu: Transaction check succeeded.
    amazon-ebs.al2023neu: Running transaction test
    amazon-ebs.al2023neu: Transaction test succeeded.
    amazon-ebs.al2023neu: Running transaction
    amazon-ebs.al2023neu:   Preparing        :                                                        1/1
    amazon-ebs.al2023neu:   Installing       : aws-neuronx-tools-2.14.6.0-1.x86_64                    1/1
    amazon-ebs.al2023neu:   Verifying        : aws-neuronx-tools-2.14.6.0-1.x86_64                    1/1
    amazon-ebs.al2023neu:
    amazon-ebs.al2023neu: Installed:
    amazon-ebs.al2023neu:   aws-neuronx-tools-2.14.6.0-1.x86_64
    amazon-ebs.al2023neu:
    amazon-ebs.al2023neu: Complete!

==> Builds finished. The artifacts of successful builds are:
--> amazon-ebs.al2023neu: AMIs were created:
ap-northeast-1: ami-xxx

3. Built a new AL2 INF AMI with the updated script, and confirm Neuron devices and with Neuron tools tests both pass.

==> amazon-ebs.al2inf: + sudo yum install -y aws-neuronx-tools
    amazon-ebs.al2inf: Loaded plugins: dkms-build-requires, priorities, update-motd, upgrade-helper
    amazon-ebs.al2inf: Resolving Dependencies
    amazon-ebs.al2inf: --> Running transaction check
    amazon-ebs.al2inf: ---> Package aws-neuronx-tools.x86_64 0:2.14.6.0-1 will be installed
    amazon-ebs.al2inf: --> Finished Dependency Resolution
    amazon-ebs.al2inf:
    amazon-ebs.al2inf: Dependencies Resolved
    amazon-ebs.al2inf:
    amazon-ebs.al2inf: ================================================================================
    amazon-ebs.al2inf:  Package                  Arch          Version             Repository     Size
    amazon-ebs.al2inf: ================================================================================
    amazon-ebs.al2inf: Installing:
    amazon-ebs.al2inf:  aws-neuronx-tools        x86_64        2.14.6.0-1          neuron         28 M
    amazon-ebs.al2inf:
    amazon-ebs.al2inf: Transaction Summary
    amazon-ebs.al2inf: ================================================================================
    amazon-ebs.al2inf: Install  1 Package
    amazon-ebs.al2inf:
    amazon-ebs.al2inf: Total download size: 28 M
    amazon-ebs.al2inf: Installed size: 97 M
    amazon-ebs.al2inf: Downloading packages:
    amazon-ebs.al2inf: Running transaction check
    amazon-ebs.al2inf: Running transaction test
    amazon-ebs.al2inf: Transaction test succeeded
    amazon-ebs.al2inf: Running transaction
    amazon-ebs.al2inf:   Installing : aws-neuronx-tools-2.14.6.0-1.x86_64                          1/1
    amazon-ebs.al2inf:   Verifying  : aws-neuronx-tools-2.14.6.0-1.x86_64                          1/1
    amazon-ebs.al2inf:
    amazon-ebs.al2inf: Installed:
    amazon-ebs.al2inf:   aws-neuronx-tools.x86_64 0:2.14.6.0-1
    amazon-ebs.al2inf:
    amazon-ebs.al2inf: Complete!

--> amazon-ebs.al2inf: AMIs were created:
ap-northeast-1: xxx

New tests cover the changes: no

Description for the changelog

N/A

Licensing

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.