[BUGFIX] Reactivate first level element icons on hover in language mode

Change-Id: I66d88d442695b2a593e23437391eaa8781bf5f8c
Resolves: #58810
Reviewed-on: https://review.typo3.org/30120
Reviewed-by: Lorenz Ulrich
Tested-by: Lorenz Ulrich
Reviewed-by: Jo Hasenau
Tested-by: Jo Hasenau