Cleanup: it was absolutely stupid for game_wants_statusbar() to be a

function, since it took no parameters by which to vary its decision,
and in any case it's hard to imagine a game which only
_conditionally_ wants a status bar. Changed it into a boolean data
field in the backend structure.

git-svn-id: svn://svn.tartarus.org/sgt/puzzles@6417 cda61777-01e9-0310-a592-d414129be87e