Fix: 1to50 javascript syntax error

src/game/mouse/one_to_fifty/game.js

@@ -96,7 +96,7 @@ var Game = {
 		this.god = new God(God.POSITION_X, God.POSITION_Y, this);
 	},
 
-	makeChocoballArray(firstNumber, lastNumber) {
+	makeChocoballArray: function(firstNumber, lastNumber) {
 		var numberArray = new Array();
 		for(var i = firstNumber; i < lastNumber + 1; i++) {
 			numberArray.push(i);