Move check/cmode temporary vars off of mapclass

Yet another set of temporary variables is on a global class when they
shouldn't be. These two are only used in tower background functions and
are never used anywhere else, so they're clearly temporaries.

desktop_version/src/Map.h

@@ -111,7 +111,6 @@ public:
 
     //This is the old colour cycle
     int r, g,b;
-    int check, cmode;
     int colstate, colstatedelay;
     int colsuperstate;
     int spikeleveltop, spikelevelbottom;