[RCTFBLoginManager] avoiding multiple callback calls in case of missing permissions
[RCTFBLoginManager] avoiding multiple callback calls in case of missing permissions

lwhiteley/react-native-facebook-login,leonacky/react-native-facebook-login,lwhiteley/react-native-facebook-login,leonacky/react-native-facebook-login,lwhiteley/react-native-facebook-login,leonacky/react-native-facebook-login