[BUGFIX] Wrong fieldname in sys_file_reference

https://review.typo3.org/27549 changed the value
for fieldname in sys_file_reference. But the models
where not adjusted.

Now http://forge.typo3.org/issues/47694 is part
of core and dependecy of ext:news is raised
to 6.2 the fieldname can be removed from the models.

Resolves: #57156
Change-Id: Iec7bda93b8b3f490667cc43b62cdfaeaa54b7000
Reviewed-on: https://review.typo3.org/28608
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer