[BUGFIX] Error in filelist for Storage context menu

The click menu for storage roots or mount points in filelist contains
functions which are not supported (e.g. cut/copy). This patch improves the
menu and only displays options which are allowed for storages/mount points
and for the current user.

Change-Id: I8e729eb3ea2d3977551ec689230ac9accfa76c4c
Resolves: #46575
Releases: 6.1, 6.0
Reviewed-on: https://review.typo3.org/19204
Reviewed-by: Andreas Wolf
Tested-by: Andreas Wolf