[FOLLOWUP][BUGFIX] Fetching configuration-comments should require no comma

Fix regex to capture description correctly.

Resolves: #78333
Releases: master, 7.6
Change-Id: I8b731c2e1c2a4e9e3d1fdf01823bbefadee367fb
Reviewed-on: https://review.typo3.org/50445


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>