PLT-6226 fixing race in IsAuth (#7296)

* Fixing race in isAuth function

* PLT-6226 fixing race in IsAuth

* Moving int64 to top so it's aligned

* Adding comment and fixing asymmetric call

app/websocket_router.go

@@ -43,7 +43,7 @@ func (wr *WebSocketRouter) ServeWebSocket(conn *WebConn, r *model.WebSocketReque
 	}
 
 	if r.Action == model.WEBSOCKET_AUTHENTICATION_CHALLENGE {
-		if conn.SessionToken != "" {
+		if conn.GetSessionToken() != "" {
 			return
 		}
 
@@ -63,7 +63,8 @@ func (wr *WebSocketRouter) ServeWebSocket(conn *WebConn, r *model.WebSocketReque
 				UpdateLastActivityAtIfNeeded(*session)
 			}()
 
-			conn.SessionToken = session.Token
+			conn.SetSession(session)
+			conn.SetSessionToken(session.Token)
 			conn.UserId = session.UserId
 
 			HubRegister(conn)