Fix drawing areas

the way that the vertex is being added to is the original one,
not the one with the 'end' node, so there is no need to remove it.

The new node de-dupe code was making this break area drawing.

Fixes #1322

js/id/behavior/draw_way.js

@@ -98,7 +98,7 @@ iD.behavior.DrawWay = function(context, wayId, index, mode, baseGraph) {
         return function(graph) {
             if (isArea) {
                 return graph
-                    .replace(way.removeNode(end.id).addNode(newNode.id, index))
+                    .replace(way.addNode(newNode.id, index))
                     .remove(end);
 
             } else {