[BUGFIX] Change visibility of two properties to public

Properties $MOD_SETTINGS and $modTSconfig of RecordListController
are still used by DatabaseRecordList through $GLOBALS['SOBE'].
These two have to stay public for the time being to not trigger
a bunch of deprecation log entries on each call of the list module.

Change-Id: I87188b2065f4933e45203de58027f92db98bf840
Resolves: #86418
Related: #86198
Releases: master
Reviewed-on: https://review.typo3.org/58430


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>