t/data/player_response.html should be removed and replaced

[oalders]

See discussion at https://github.com/xaicron/p5-www-youtube-download/commit/358223b20add9f810f73ceb6bf97e222079819b3#r42587661

Basically, we don't want to run into any issues around infringement. The safest way to do this would probably be to remove t/data/player_response.html and update the test in question to use a different file for mocking -- one which contains the structure which we need for the test, but which doesn't appear to be a copy/paste of output from a 3rd party.