Remove unused argument from wm.Undo.beginMapDraw

Author: Joncom

lib/weltmeister/undo.js

@@ -124,7 +124,7 @@ wm.Undo = ig.Class.extend({
 	// -------------------------------------------------------------------------
 	// Map changes
 
-	beginMapDraw: function( layer ) {
+	beginMapDraw: function() {
 		this.currentAction = {
 			type: wm.Undo.MAP_DRAW,
 			time: Date.now(),