[TASK] Style progress bar with Twitter Bootstrap in ext:scheduler

Resolves: #63036
Releases: master
Change-Id: Iee337cc14a9d64b49484769aab6e263dfc678bea
Reviewed-on: http://review.typo3.org/34276
Reviewed-by: Kai Vogel <kai.vogel@speedprogs.de>
Tested-by: Kai Vogel <kai.vogel@speedprogs.de>
Reviewed-by: Felix Kopp <felix-source@phorax.com>
Tested-by: Felix Kopp <felix-source@phorax.com>