Fix groups log messages. https://github.com/Koenkk/zigbee2mqtt/issues/1848

lib/extension/groups.js

@@ -137,7 +137,6 @@ class Groups {
 
     updateDeviceGroup(ID, cmd, groupID) {
         let payload = null;
-        const orignalCmd = cmd;
         if (cmd === 'add') {
             payload = {groupid: groupID, groupname: ''};
             cmd = 'add';
@@ -159,10 +158,18 @@ class Groups {
                 logger.info(`Successfully ${cmd} ${ieeeAddr} to ${groupID}`);
 
                 // Log to MQTT
+                const lookup = {
+                    'add': 'device_group_add',
+                    'remove': 'device_group_remove',
+                    'removeAll': 'device_group_remove_all',
+                };
+
                 this.mqtt.log({
-                    device: settings.getDevice(ieeeAddr).friendly_name,
-                    group: groupID,
-                    action: orignalCmd,
+                    type: lookup[cmd],
+                    message: {
+                        device: settings.getDevice(ieeeAddr).friendly_name,
+                        group: groupID,
+                    },
                 });
 
                 // Update group cache