Fix still being able to unlock things in custommode

This was caused by the fact that not all unlocks were done through the
Game::unlocknum() function. Some just set the unlock number directly.
But it's fixed now.

desktop_version/src/Game.cpp

@@ -3390,7 +3390,7 @@ void Game::updatestate()
             {
                 //flip mode complete
                 NETWORK_unlockAchievement("vvvvvvgamecompleteflip");
-                unlock[19] = true;
+                unlocknum(19);
             }
 
             if (bestgamedeaths == -1)
@@ -3425,7 +3425,7 @@ void Game::updatestate()
             if (nodeathmode)
             {
                 NETWORK_unlockAchievement("vvvvvvmaster"); //bloody hell
-                unlock[20] = true;
+                unlocknum(20);
                 state = 3520;
                 statedelay = 0;
             }

desktop_version/src/Script.cpp

@@ -1515,7 +1515,7 @@ void scriptclass::run()
 			}
 			else if (words[0] == "entersecretlab")
 			{
-				game.unlock[8] = true;
+				game.unlocknum(8);
 				game.insecretlab = true;
 			}
 			else if (words[0] == "leavesecretlab")