Change gamestate ints to their enum names

This is to make it easier to read, so I don't have to reference Enums.h
if I want to know what they are referring to.

desktop_version/src/Logic.cpp

@@ -69,7 +69,7 @@ void gamecompletelogic()
         graphics.showcutscenebars = false;
         graphics.cutscenebarspos = 0;
         //Return to game
-        game.gamestate = 7;
+        game.gamestate = GAMECOMPLETE2;
         graphics.fademode = 4;
     }
 }
@@ -106,7 +106,7 @@ void gamecompletelogic2()
         music.currentsong=tmp;
         //Return to game
         map.colstate = 10;
-        game.gamestate = 1;
+        game.gamestate = TITLEMODE;
         graphics.fademode = 4;
         music.playef(18);
         game.createmenu(Menu::gamecompletecontinue);