[bugfixing] Add On install button doesn't refresh to show activate ac…

[MaximilianoRicoTabo]

…tion

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• Have you followed the Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

• Tweak the Add On page code and fix the issue that prevented the button to show the activate action.

• Tweak the Add On page code and fix the issue that prevented the button to show the activate action.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?

Changelog entry

Enter a summary of all changes on this Pull Request. This will appear in the changelog if accepted.

[dparker1005]

Closing in favor of #3255