[TASK] Set stop date when disabling user

Resolves: #60938
Change-Id: I8f59e052aebc1b9d8736d496056e8bfcdbe5f420
Reviewed-on: http://review.typo3.org/32125
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>