Put back MQTT_Enabled in Monitors

db/zm_create.sql.in

@@ -546,6 +546,7 @@ CREATE TABLE `Monitors` (
   `RTSPServer`  BOOLEAN NOT NULL DEFAULT FALSE,
   `RTSPStreamName`  varchar(255) NOT NULL default '',
   `Importance`  enum('Normal','Less','Not') NOT NULL default 'Normal',
+  `MQTT_Enabled`  BOOLEAN NOT NULL DEFAULT false,
   `MQTT_Subscriptions`  varchar(255) default '',
   PRIMARY KEY (`Id`)
 ) ENGINE=@ZM_MYSQL_ENGINE@;