FB Auth remains in-app if background disabled
FB Auth remains in-app if background disabled

i.e., if UIApplicationExitsOnSuspend=YES

[Deliver #34692923]

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