CC-3659: Override on Master/Show Source connection needs to have

better description about what the override field actually does.

- fixed description
- extra fix:
 - using variable instead of hard coded text
 - removed unnecessary code

airtime_mvc/application/controllers/PreferenceController.php

@@ -238,9 +238,9 @@ class PreferenceController extends Zend_Controller_Action
                 Application_Model_RabbitMq::SendMessageToPypo("update_stream_setting", $data);
                 $this->view->statusMsg = "<div class='success'>Stream Setting Updated.</div>";
             }
-            $live_stream_subform->updateConnectionURLs();
         }
         
+        $live_stream_subform->updateVariables();
         $this->view->confirm_pypo_restart_text = "If you change the username or password values for an enabled stream the playout engine will be rebooted and your listeners will hear silence for 5-10 seconds. Changing the following fields will NOT cause a reboot: Stream Label (Global Settings), and Switch Transition Fade(s), Master Username, and Master Password (Input Stream Settings).";
         
         $this->view->num_stream = $num_of_stream;