[BUGFIX] keep options array for TableGarbageCollectionTask

scheduler now keeps an options sub-array if it has been populated
before ext_localconf.php runs.

User can define additional options for TableGarbageCollectionTask as
per extension documentation, i.e. tables can be added from user
configuration files such as AdditionalConfiguration.php.

Resolves: #67874
Releases: master, 6.2
Change-Id: I9eee7e1315e4a5049cee9db694c1f5a8375c8475
Reviewed-on: http://review.typo3.org/40830


Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>