Fix deprecated methods activateFetched, setConfigSettings

[crazyhappygame]

According to
https://firebase.google.com/docs/reference/android/com/google/firebase/remoteconfig/FirebaseRemoteConfig.html#public-void-setconfigsettings-firebaseremoteconfigsettings-settings
C++ SDK uses deprecated methods activateFetched, setConfigSettings

[chkuang-g]

Thank you for reporting this.

I think you should still be able to use it with no problem. But we will change it.

[crazyhappygame]

Yes it works but I have a filling that "Async" versions provide better user experience ;)