[BUGFIX] Show "Add task" after stopping a running task

Check if CMD is "stop" to make "Add task" visible.

Resolves: #65235
Releases: master, 6.2
Change-Id: Ia5b87f6105e14e224e8db0541d6fe36a021d8ba3
Reviewed-on: http://review.typo3.org/37113


Reviewed-by: Frederic Gaus <gaus@flagbit.de>
Tested-by: Frederic Gaus <gaus@flagbit.de>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>