fix: Missing end profiling sample (Unity-Technologies#1118)

There was an EndSample missing in InvokeRPC

Author: VALERE91Unity

Runtime/Core/NetworkManager.cs

@@ -1318,6 +1318,7 @@ internal void InvokeRpc(MessageFrameItem item, NetworkUpdateStage networkUpdateS
                         networkBehaviour.__getTypeName(),
                         item.StreamSize);
                 }
+                s_InvokeRpc.End();
 #endif
             }
         }