Update RNFIRMessaging.m

ios/RNFIRMessaging.m

@@ -322,7 +322,7 @@ RCT_EXPORT_MODULE();
         [[FIRMessaging messaging] setDelegate:self];
     });
   
-  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(10 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
     if(!jsHandlerRegistered){
       [self sendPendingNotifications];
     }