[BUGFIX] Respect edit content permissions in Web->Page

The PageModule did not respect the permission for edit content when
rendering buttons or enabling drag & drop.
Clicking the buttons lead into an error message.

Resolves: #50618
Releases: master
Change-Id: I4c3a6f0d1d7362b58a5a9c05078b51f3c533d53a
Reviewed-on: https://review.typo3.org/44162


Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>