[BUGFIX] Link thumbnail in preview to edit mode

Since all elements in the preview of content elements in page module
link to edit mode, the preview of Text&Media element should also link
to the edit mode.

Resolves: #70852
Releases: master
Change-Id: I2d12d4c444f1331307a36684974b26ec50d32468
Reviewed-on: https://review.typo3.org/44164


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Frans Saris <franssaris@gmail.com>