Remove useless attribute rcol from finalclass

The rcol of finalclass is always 6, so there's no reason to have an
attribute there as if you could change it or anything.

desktop_version/src/Map.cpp

@@ -1406,7 +1406,6 @@ void mapclass::loadlevel(int rx, int ry)
 		roomname = finallevel.roomname;
 		tileset = 1;
 		background = 3;
-		graphics.rcol = finallevel.rcol;
 		graphics.backgrounddrawn = false;
 
 		if (finalstretch)