Use site action to determine checkbox processing

Properly set and use the route action to help us determine what settings page
we are processing and use it to gate the handling of checkboxes on the site
settings page.

OpenVBX/controllers/settings/site.php

@@ -38,7 +38,7 @@ function __construct()
 		$this->admin_only($this->section);
 	}
 
-	public function index($action = '', $id = false)
+	public function index($action = 'site', $id = false)
 	{
 		return $this->site($action, $id);
 	}
@@ -311,18 +311,15 @@ private function update_site()
 						$this->settings->add($name, trim($value), $this->tenant->id);
 					}
 				}
-
-				// rewrite enabled is a marker to detect which group of settings
-				// we're currently saving
-				// @todo - include a 'section' or 'group' param in the submitted
-				// data to do this instead and make it more clear to what's happening
-				if (isset($site['rewrite_enabled']))
+
+				if ($this->form_action == 'site')
 				{
 					foreach ($notification_settings as $name)
 					{
 						$value = (!empty($site[$name]) ? 1 : 0);
 						$this->settings->add($name, $value, $this->tenant->id);
 					}
+
 				}
 
 				// Connect App (if applicable)