Adding handling of host disconnect (#486)

(cherry picked from commit 89f9918)

Author: LPLafontaineB

Assets/BossRoom/Scripts/Shared/Net/ConnectionManagement/ClientGameNetPortal.cs

@@ -120,8 +120,9 @@ private void OnDisconnectReasonReceived(ConnectStatus status)
 
         private void OnDisconnectOrTimeout(ulong clientID)
         {
-            // Only handle client disconnect
-            if (!NetworkManager.Singleton.IsHost)
+            // This is also called on the Host when a different client disconnects. To make sure we only handle our own disconnection, verify that we are either
+            // not a host (in which case we know this is about us) or that the clientID is the same as ours if we are the host.
+            if (!NetworkManager.Singleton.IsHost || NetworkManager.Singleton.IsHost && NetworkManager.Singleton.LocalClientId == clientID)
             {
                 //On a client disconnect we want to take them back to the main menu.
                 //We have to check here in SceneManager if our active scene is the main menu, as if it is, it means we timed out rather than a raw disconnect;