If the context is in development mode, the clear cache system icon
is always shown in the toolbar, even if the user is not an admin.

Resolves: #72964
Releases: master, 7.6, 6.2
Change-Id: I674df49fee14ded4b2190cca098ddf146047e5f0
Reviewed-on: https://review.typo3.org/46264


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>