ha-tabs: adapt _affectScroll() to RTL

[ildar170975]

Breaking change

Proposed change

The _affectScroll() function (as well as original paper-tabs::_affectScroll()) seems to be not working properly for RTL - and thus causing an issue (#23951).
This PR adapts _affectScroll() for RTL - but only for ha-tabs, not for paper-tabs in "edit-mode". This will be another PR hopefully.

Warning: I am not able to test this PR these forthcoming days on a live machine, but it seems to be good. Please check it for all of us. Sorry for inconvenience.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes # RTL: wrong chevron buttons for a header #23951
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io