[TASK] Remove condensed mode leftovers

The condensed mode user setting has been removed
three years ago with #24585

Now also remove the leftover parts.
Keep the language labels to not interfere
with older versions.

Resolves: #56479
Releases: 6.2
Change-Id: I8cb3ebc5aac162357ce1d343eed1031156ccd749
Reviewed-on: https://review.typo3.org/27980
Reviewed-by: Benjamin Mack
Tested-by: Benjamin Mack
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters