[BUGFIX] Allow form definitions to be moved or put to recycle folder

[BUGFIX] Allow form definitions to be moved or put to recycle folder

After fixing the issue of TYPO3-CORE-SA-2018-003 file commands for
form definitions (those ending with new ".form.yaml" extension) has
been limited. Since the "move" command theoretically would allow to
move and rename a file, it has been denied as well. However, it is
okay to move those files around in case the file extension has not
been changed or when being moved to a recycle folder.

Resolves: #85570
Releases: master, 8.7
Change-Id: Ic1f40d061b330d62138a42be9e868fca77b17187
Reviewed-on: https://review.typo3.org/57688
Reviewed-by: Ralf Zimmermann <ralf.zimmermann@tritum.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>