[BUGFIX] Sorting of file links CE is broken

On editing a content element of CType "uploads" ("File Links") you can
define fields for sorting and target of the files. Those fields are not
evaluated during the frontend rendering process.

Change-Id: I3d59f3088e7600b5c4c57c5187f288b600adaf16
Fixes: #46444
Releases: 6.1, 6.0
Reviewed-on: https://review.typo3.org/19649
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter