[BUGFIX] Fetching configuration-comments should require no comma

So far a comma was required before the comment. But CGL says that
the last element in an array should have no trailing comma.

Change-Id: Ia8149624e1b5bb1d4a685b70f3c197344733e22f
Resolves: #78333
Releases: master, 7.6
Reviewed-on: https://review.typo3.org/50265


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>