[BUGFIX] Fix link to edit file metadata in full window

When opening a window with a file reference in a full window
it is not possible to click the edit metadata button.

Use a normal href to avoid the issue with choosing the correct frame.

Resolves: #76729
Releases: master,7.6
Change-Id: Iaa140f28104782870c50ef0d876e472067a09fed
Reviewed-on: https://review.typo3.org/49225


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>