Merge pull request #4878 from node-red/4876-mqtt-status

Set status of mqtt nodes to "disconnected" when deregistered from broker

packages/node_modules/@node-red/nodes/core/network/10-mqtt.js

@@ -742,6 +742,7 @@ module.exports = function(RED) {
         };
 
         node.deregister = function(mqttNode, done, autoDisconnect) {
+            setStatusDisconnected(mqttNode, false);
             delete node.users[mqttNode.id];
             if (autoDisconnect && !node.closing && node.connected && Object.keys(node.users).length === 0) {
                 node.disconnect(done);