App fails to get thumbnail of video file

[domdomegg]

App returns a 404 error as it is looking at the wrong path:

BasicNetwork.performRequest: Unexpected response code 404 for https://upload.wikimedia.org/wikipedia/commons/thumb/2/2c/Freedom_of_the_City_of_London_Parade_2016.webm/320px-Freedom_of_the_City_of_London_Parade_2016.webm.png

This is getting the error as it should be using two dashes and jpg like so:

https://upload.wikimedia.org/wikipedia/commons/thumb/2/2c/Freedom_of_the_City_of_London_Parade_2016.webm/320px--Freedom_of_the_City_of_London_Parade_2016.webm.jpg

[domdomegg]

Screenshot:

[domdomegg]

See PR #122