[TASK] Remove Chrome Repainting CSS hack

A CSS hack was introduced with #f191477a
see (https://forge.typo3.org/issues/66742)
for a workaround with Chrome < 40
back in 2015, which is not needed anymore.

https://bugs.chromium.org/p/chromium/issues/detail?id=412414
https://bugs.chromium.org/p/chromium/issues/detail?id=383261

Resolves: #93339
Releases: master
Change-Id: I0c333f90d1dca019b45ff7b9f97e0c76d57a03b5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/67499


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>