[BUGFIX] ShortcutVH must not ignore options.enableBookmarks

Shortcuts/Bookmarks can be disabled for users by using
TsConfig options.enableBookmarks = 0.

This setting must be checked in the ViewHelper too.

Change-Id: I5f53b9cb2863ac8a9e7501e63299482567509f2b
Resolves: #49220
Releases: 6.2
Reviewed-on: https://review.typo3.org/21681
Reviewed-by: Eric Chavaillaz
Tested-by: Eric Chavaillaz
Reviewed-by: Stefan Froemken
Tested-by: Stefan Froemken
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer