[BUGFIX] Use `file.identifier` in search result of filelist

The search results of the filelist access the property
`file.combinedIdentifier`. The property is not available anymore, so this
patch uses `file.identifier`, which maps to `FileFacade::identifier()`
and returns a handcrafted combined identifier.

Resolves: #83849
Releases: master, 8.7
Change-Id: I98bcd9e40c9fdebddf1079ad0240a1d3f6ac8d6e
Reviewed-on: https://review.typo3.org/55667


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Claus Due <claus@phpmind.net>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>