Fix [2989717] - Missing location button

http://sourceforge.net/support/tracker.php?aid=2989717

org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/editor/WLocationEditor.java

@@ -78,6 +78,7 @@ public class WLocationEditor extends WEditor implements EventListener, PropertyC
     public WLocationEditor(GridField gridField) {
 		super(new Locationbox(), gridField);
 		m_Location = (MLocationLookup)gridField.getLookup();
+        init();
 	}
 
     private void init()