Revert "Fixing logic for delaying setting external user id"

This reverts commit fe3ea48.

Author: emawby

iOS_SDK/OneSignalSDK/Source/OneSignal.m

@@ -2668,7 +2668,7 @@ + (void)setExternalUserId:(NSString *)externalId withExternalIdAuthHashToken:(NS
         return;
 
     // Can't set the external id if init is not done or the app id or user id has not ben set yet
-    if (!_didCallDownloadParameters) {
+    if (!performedOnSessionRequest) {
         // will be sent as part of the registration/on_session request
         pendingExternalUserId = externalId;
         pendingExternalUserIdHashToken = hashToken;