[iOS] Fix `Content-Type` meta for upload
[iOS] Fix `Content-Type` meta for upload

mybigday/react-native-s3,nharlow89/react-native-s3,nharlow89/react-native-s3,mybigday/react-native-s3,nharlow89/react-native-s3,mybigday/react-native-s3,nharlow89/react-native-s3,mybigday/react-native-s3