Modified zIndex prop to only show when defined
Modified zIndex prop to only show when defined

Better to just leave zIndex out of the style if it's not being defined

devBrian/react-native-dropdownalert,testshallpass/react-native-dropdownalert,devBrian/react-native-dropdownalert,devBrian/react-native-dropdownalert,testshallpass/react-native-dropdownalert,testshallpass/react-native-dropdownalert