Always show OTR session switcher, disable for single session.

src/net/java/sip/communicator/plugin/otr/authdialog/OTRv3OutgoingSessionSwitcher.java

@@ -433,6 +433,7 @@ public void actionPerformed(ActionEvent e)
      */
     private void updateEnableStatus()
     {
-        this.menu.setVisible(this.menu.getItemCount() > 1);
+        this.menu.setEnabled(this.menu.getItemCount() > 1);
+        this.menu.setVisible(true);
     }
 }