fixed bug due to unsplash website change

[chronologos]

The unsplash website recently updated to a non-paginated, continually loading version. I made a small fix for that.

[DMarby]

Hello,

thanks for your contribution!
I'm going to close this PR since it's an invalid fix, the website is still paginated, it has however changed the way you can filter the feed, so the URL does need a change.

For future reference, please refrain from changing the code-style of a project when submitting a PR, as it makes it very hard to see the actual code changes.