[BUGFIX] Enhance color-picker position in constant editor

Releases: master
Resolves: #75656
Change-Id: I0dbe89b56ffdd8f677ed5a9b5a1fa08a4d92dd9c
Reviewed-on: https://review.typo3.org/47836


Reviewed-by: Philipp Gampe <philipp.gampe@typo3.org>
Tested-by: Philipp Gampe <philipp.gampe@typo3.org>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>