[6.15.z] virtwho config edit name message check update

[Satellite-QE]

Cherrypick of PR: #1096

When update the virt-who config name to another name, the edit message has been updated to check the new virt-who config, but the previous code still check the old non-exist virt-who config.

Cases :PASS

(robottelo_vv) [virtwho@dell-per740-68-vm-04 robottelo]$ pytest ./tests/foreman/virtwho/ui/test_esx.py  -k test_positive_virtwho_manager_role --disable-pytest-warnings -q
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1 passed, 33 deselected, 15 warnings in 307.44s (0:05:07)
2023-12-20 03:10:48 - robottelo - WARNING - missing grid_url or session_id. unable to clean video files.