User group not removed from memory upon deletion in peering environment

[ijustw0rkhere]

Describe the bug
If you delete a user group in a peering environment, it is not properly removed until a server restart.

To Reproduce
Steps to reproduce the behavior:

1. Delete a user group
2. Refresh web UI
3. Deleted user group shows back up

Expected behavior
A deleted user group should be removed from memory in a peering environment without having to reboot the server

Server Software (please complete the following information):

• OS: Debian
• Version: 1.1.33

Your config.json file

{
  "$schema": "https://raw.githubusercontent.com/Ylianst/MeshCentral/master/meshcentral-config-schema.json",
  "__comment1__": "This is a simple configuration file, all values and sections that start with underscore (_) are ignored. Edit a section and remove the _ in front of the name. Refer to the user's guide for details.",
  "__comment2__": "See node_modules/meshcentral/sample-config-advanced.json for a more advanced example.",
  "settings": {
    "mongoDb": "mongodb://172.16.0.93:27017/?replicaSet=rs0",
    "mongoDbBulkOperations": true,
    "mongoDbChangeStream": true,
    "sessionKey": "MyReallySecretPassword1",
    "port": 443,
    "redirPort": 0,
    "mpsPort": 0,
    "exactPorts": true
  },
  "domains": {
    "": {
      "title": "meshdev1"
    }
  },
  "peers": {
    "serverId": "meshdev1",
    "servers": {
      "meshdev1": {"url": "wss://172.16.0.93:443/"},
      "meshdev2": {"url": "wss://172.16.0.94:443/"}
    }
  }
}