Use callback flags in reachability instead of the initial flags (#4949)

* Use callback flags in reachability instead of the initial flags

* styled

Author: ddnan

GoogleDataTransport/GDTCORLibrary/GDTCORReachability.m

@@ -60,7 +60,8 @@ + (SCNetworkReachabilityFlags)currentFlags {
   __block SCNetworkReachabilityFlags currentFlags;
   dispatch_sync([GDTCORReachability sharedInstance] -> _reachabilityQueue, ^{
     GDTCORReachability *reachability = [GDTCORReachability sharedInstance];
-    currentFlags = reachability->_flags ? reachability->_flags : reachability->_callbackFlags;
+    currentFlags =
+        reachability->_callbackFlags ? reachability->_callbackFlags : reachability->_flags;
     GDTCORLogDebug("Initial reachability flags determined: %d", currentFlags);
   });
   return currentFlags;