legacy facebook auth should still call delegate
legacy facebook auth should still call delegate

[Deliver #29261107]

socialize/socialize-sdk-ios,dontfallisleep/socialize-sdk-ios,socialize/socialize-sdk-ios,socialize/socialize-sdk-ios,socialize/socialize-sdk-ios,dontfallisleep/socialize-sdk-ios,dontfallisleep/socialize-sdk-ios,dontfallisleep/socialize-sdk-ios,dontfallisleep/socialize-sdk-ios,socialize/socialize-sdk-ios,socialize/socialize-sdk-ios,dontfallisleep/socialize-sdk-ios