fix some status messages in the Rummy game
fix some status messages in the Rummy game

Changes set-status-text to set-status so that status messages are displayed to user.
Also, changed lang to `racket/gui' from `mzscheme'.

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