refractor(file): property filesystem of Entry is lowercase
refractor(file): property filesystem of Entry is lowercase

fixes #720

klirix/ionic-native,xueron/ionic-native,xueron/ionic-native,xueron/ionic-native,driftyco/ionic-native,driftyco/ionic-native,klirix/ionic-native,klirix/ionic-native,xueron/ionic-native,driftyco/ionic-native