Core/Networking: Fixed authserver socket read handlers being called on incorrect thread

(cherry picked from commit 3ad05386c8)

src/server/shared/Networking/SocketMgr.h

@@ -66,6 +66,8 @@ public:
         for (int32 i = 0; i < _threadCount; ++i)
             _threads[i].Start();
 
+        _acceptor->SetSocketFactory([this]() { return GetSocketForAccept(); });
+
         return true;
     }