Authentication scopes for web are hardcoded

[fotiDim]

Currently for the web implementation the scopes are hardcoded within spotify_sdk_web.dart:

/// spotify auth scopes
  static const List<String> authenticationScopes = [
    'streaming',
    'user-read-email',
    'user-read-private',
    'app-remote-control',
    'user-modify-playback-state',
    'playlist-read-private',
    'playlist-modify-public',
    'user-read-currently-playing'
  ];

We should be taking them from SpotifySdk.getAuthenticationToken or connectToSpotifyRemote .