fix(label-editing): fix isTouch not being processed

Actually use event.isTouch to check label editing activation on
create.end.

This makes 7e928ec709 work.

lib/features/label-editing/LabelEditingProvider.js

@@ -48,7 +48,7 @@ function LabelEditingProvider(eventBus, canvas, directEditing, commandStack, res
 
     var element = event.shape,
         canExecute = event.context.canExecute,
-        isTouch;
+        isTouch = event.isTouch;
 
     // TODO(nikku): we need to find a way to support the direct editing
     // on mobile devices; right now this will break for desworkflowediting on mobile devices