Add remove to remove device connection

Author: LucHeart

LiveControlGateway/LifetimeManager/HubLifetimeManager.cs

@@ -162,6 +162,8 @@ public async Task RemoveDeviceConnection(IHubController hubController)
 
             if(oldControllerLifetime.HubController != hubController) return;
 
+            _lifetimes.TryRemove(hubController.Id, out _);
+            
             foreach (var websocketController in WebsocketManager.LiveControlUsers.GetConnections(hubController.Id))
                 await websocketController.UpdateConnectedState(false);
         }