fixed typo in game name: renamed SNAKE3D to SPACESNAKE

src/main/java/eu/mhsl/minenet/minigames/instance/game/GameList.java

@@ -42,7 +42,7 @@ public enum GameList {
     HIGHGROUND(new HighGroundFactory(), GameType.PVP),
     FASTBRIDGE(new FastbridgeFactory(), GameType.OTHER),
     BLOCKBREAKRACE(new BlockBreakRaceFactory(), GameType.OTHER),
-    SNAKE3D(new SpaceSnakeFactory(), GameType.PVP);
+    SPACESNAKE(new SpaceSnakeFactory(), GameType.PVP);
 
     private final GameFactory factory;
     private final GameType type;