[BUGFIX] ext:lowlevel advanced query where clauses

* "Make query" vanished from the interface since #94121
due to a broken type comparison on $this->queryConfig.
* Date fields now properly load date pickers.

Resolves: #94862
Resolves: #94884
Related: #94121
Releases: master
Change-Id: I69602722bb7ee83bd616b3e6d175725bd9a70907
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70539


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>