Container.getFirst was using an incorrect Array Utils function GetFirstElement, when it should have been using GetFirst. It now uses the correct function. Fix phaserjs#4244

Author: photonstorm

src/gameobjects/container/Container.js

@@ -610,7 +610,7 @@ var Container = new Class({
      */
     getFirst: function (property, value, startIndex, endIndex)
     {
-        return ArrayUtils.GetFirstElement(this.list, property, value, startIndex, endIndex);
+        return ArrayUtils.GetFirst(this.list, property, value, startIndex, endIndex);
     },
 
     /**

src/structs/List.js

@@ -283,7 +283,7 @@ var List = new Class({
      */
     getFirst: function (property, value, startIndex, endIndex)
     {
-        return ArrayUtils.GetFirstElement(this.list, property, value, startIndex, endIndex);
+        return ArrayUtils.GetFirst(this.list, property, value, startIndex, endIndex);
     },
 
     /**