feat(ios): load media files with custom scheme+hostname and leading directory paths

[erisu]

Platforms affected

ios

Motivation and Context

Able to load media file paths that are written in custom scheme+hostname format or with a leading slash to represent root directory of "www"

Description

Updated conditional checks

Testing

// const mediaFile = "https://www...wav";
// const mediaFile = cordova.file.applicationDirectory + '/www/media/test.wav';
// const mediaFile = 'app://localhost/media/test.wav';
const mediaFile = '/media/test.wav';

const myMedia = new Media(mediaFile, onSuccess, onError);
myMedia.play();

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary