Changes based on patch from DO-3271757-8 based on the work from users elgandoz and pasqualle.

https://www.drupal.org/project/toolbar_menu/issues/3271757

Initial changes based on the work from @elgandoz and @pasqualle:
https://www.drupal.org/project/toolbar_menu/issues/3271757#comment-15163405

to fix a CSS class name conflict with the Gin theme.

changed target branch from 8.x-2.x to 3.x

added 4 commits

• 6ce2ed7a...ffd6b0cb - 3 commits from branch project:3.x
• d7573bbe - Changes based on patch from DO-3271757-8 based on the work from users elgandoz and pasqualle.

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