[CLEANUP] Remove $language from Extbase custom statement

The parameter $language in extbase's custom statement is not
used anywhere and does not make any sense in use with dbal.

Releases: 6.2
Resolves: #55580
Change-Id: I9c7edda24918b328da66872ef782a6d0e83b0fff
Reviewed-on: https://review.typo3.org/27258
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel
Reviewed-by: Stefano Kowalke
Tested-by: Stefano Kowalke
Reviewed-by: Stefan Froemken
Tested-by: Stefan Froemken
Reviewed-by: Felix Oertel
Tested-by: Felix Oertel