Do not try to use FaceID if the privacy usage key is not configured
Do not try to use FaceID if the privacy usage key is not configured

Prevents a crash related to https://github.com/expo/expo/issues/1901

fbshipit-source-id: fe10126

exponentjs/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponentjs/exponent,exponentjs/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent,exponentjs/exponent,exponent/exponent,exponentjs/exponent,exponentjs/exponent,exponent/exponent,exponent/exponent