[TASK] Style new_folder/new_file controller

Add bootstrap classes to the new file/new folder
screen in the filelist.

Resolves: #63280
Releases: master
Change-Id: Icb4ceff4964061881d442aecce8f6c072e0565c8
Reviewed-on: http://review.typo3.org/34529
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>