[BUGFIX] Re-enable creation of compressed CSS files

The change of #73611 prevents compressed CSS files from being created.

Resolves: #73986
Related: #73611
Releases: master
Change-Id: I83e9f77d91be0189ac692deb204f15d55098d5da
Reviewed-on: https://review.typo3.org/47002


Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Michiel Roos <michiel@maxserv.com>
Tested-by: Michiel Roos <michiel@maxserv.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Jonas Götze <jonnsn@gmail.com>
Tested-by: Jonas Götze <jonnsn@gmail.com>
Reviewed-by: Andreas Wolf <andreas.wolf@typo3.org>
Tested-by: Andreas Wolf <andreas.wolf@typo3.org>