Remove finalmode from struct Summary

It's unused (other than some map.finalmode assignments which should not
be there) and we don't need it either. If we do, we can always readd
it.

desktop_version/src/Game.h

@@ -301,7 +301,6 @@ public:
         int saverx;
         int savery;
         int trinkets;
-        bool finalmode;
         bool crewstats[numcrew];
     };