[TASK] Remove unused key "name" in TBE_STYLES

There is no usage of the key "name" in
$GLOBALS['TBE_STYLES']['skins']['backend'].

Even in earlier versions of TYPO3 no usage can be found in the code.

Resolves: #94085
Releases: master
Change-Id: Idfb027da21459f0693d8a66829493e78c81f81d7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69059


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Benjamin Franzke <bfr@qbus.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benjamin Franzke <bfr@qbus.de>