[BUGFIX] containers w language "all" not showing "all" children in BE

Change-Id: I57a5a7e48426997b2c21e23eb5eeea2e61dc4321
Resolves: #51883
Reviewed-on: https://review.typo3.org/29441
Reviewed-by: Ralf-Rene Schroeder
Tested-by: Ralf-Rene Schroeder
Reviewed-by: Jo Hasenau
Tested-by: Jo Hasenau