[BUGFIX] Change default label for sys_file_references

In the List module you can select additional fields to be displayed.
For fields referencing files only, the uid is shown which does give
no hint to the real referenced file.
This change selects the uid_local field, which selects the filename
from sys_file for display.

Resolves: #67303
Releases: master, 6.2
Change-Id: I8dd301ff8d8d17baa67fafd26892a3eeea46509b
Reviewed-on: https://review.typo3.org/40477


Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Alexander Opitz <opitz.alexander@googlemail.com>
Tested-by: Alexander Opitz <opitz.alexander@googlemail.com>