[BUGFIX] getProcessedValue ignores sorting of select field values

Keep sorting of select field values which is lost during database select.

Change-Id: If0347f6c92e71a3855a00fd24bbbada7c15af386
Fixes: #27519
Releases: 6.2, 6.1, 6.0, 4.7, 4.5
Reviewed-on: https://review.typo3.org/2882
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind