Move Device width to const, update scroll throttle, fix logic determining position of current page
Move Device width to const, update scroll throttle, fix logic determining position of current page

hyb175/react-native-calendar,christopherdro/react-native-calendar,christopherdro/react-native-calendar,hyb175/react-native-calendar,christopherdro/react-native-calendar,samcorcos/react-native-calendar,samcorcos/react-native-calendar,samcorcos/react-native-calendar,hyb175/react-native-calendar