[TIMOB-27646] iOS: Ti.Filesystem.File.getDirectoryListing() doesn't return encrypted JS files

When encrypting JS code, you can no longer get the original file listing of the source JS files on iOS (but can do so on Android/Windows). This is showing up in our own test suite we run on the SDK. We try to recursively search for *.addontest.js files to load up at app run time into our suite. Those are correctly getting loaded and executed by Android, but for iOS they are not.