[TASK] Check if BE user has access to categories in BE module

The link in the backend module is useless if the editor has
no permissions to create a new category. In this case the link
should not be shown. Otherwise it will confuse editors
because nothing happens if he clicks on it.

Resolves: #50323
Change-Id: Ic81bccb136b486c3f89cf17dc3bc5ff0f1c39b65
Reviewed-on: https://review.typo3.org/22804
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer