Simplify logic to coerce DisplayMode
Simplify logic to coerce DisplayMode

Summary:
Changelog: [Internal]

TSIA

Reviewed By: ShikaSD

Differential Revision: D28061403

fbshipit-source-id: bb98fa2ccdd3f8e936bec95fbbbeace42664a608

javache/react-native,facebook/react-native,facebook/react-native,javache/react-native,pandiaraj44/react-native,facebook/react-native,facebook/react-native,facebook/react-native,pandiaraj44/react-native,facebook/react-native,janicduplessis/react-native,myntra/react-native,janicduplessis/react-native,janicduplessis/react-native,myntra/react-native,myntra/react-native,janicduplessis/react-native,javache/react-native,myntra/react-native,pandiaraj44/react-native,pandiaraj44/react-native,pandiaraj44/react-native,myntra/react-native,javache/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,facebook/react-native,janicduplessis/react-native,myntra/react-native,facebook/react-native,javache/react-native,pandiaraj44/react-native,pandiaraj44/react-native,javache/react-native,myntra/react-native,janicduplessis/react-native,javache/react-native