Fixes right click menu position on scrolled JTrees

src/main/java/de/tu_darmstadt/tk/SmartHomeNetworkSim/view/popups/NetworkTreePanel.java

@@ -515,7 +515,7 @@ public class NetworkTreePanel extends JScrollPane implements Observer {
 				mntmShowRecursive.setEnabled(false);
 			}
 			
-			rightClick.show(this,e.getX(), e.getY());
+			rightClick.show(tree,e.getX(), e.getY());
 			rightClick.setEnabled(true);
 			rightClick.setVisible(true);