gtk: fix `get-focus-window' in frame%  Closes PR 11654
gtk: fix `get-focus-window' in frame%
 Closes PR 11654

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket