[TASK] tabmenu: Get rid of mouseOver/mouseOut

Tabmenu so far used mouseOver/mouseOut to set CSS-classes.
This is replaced with :hover functionality.

Change-Id: Ie62c017bca7bf26b1d48f1ae02ebab45090f3263
Resolves: #55600
Releases: 6.2
Reviewed-on: https://review.typo3.org/27270
Reviewed-by: Marcin Sągol
Tested-by: Marcin Sągol
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn