Fix XvideosRipper: update URL pattern to match current URL scheme.

[metaprime]

Also, extract patterns to be compiled once in static members to avoid repeating the match patterns and make the code read a little more clearly.

Improve album name for the video case.

Category

This change is exactly one of the following (please change [ ] to [x]) to indicate which:

• a bug fix (Fix #...)
• a new Ripper
• a refactoring
• a style change/fix
• a new feature

Description

Please add details about your change here.

Testing

Required verification:

• I've verified that there are no regressions in mvn test (there are no new failures or errors).
• I've verified that this change works as intended.
  • Downloads all relevant content.
  • Downloads content from multiple pages (as necessary or appropriate).
  • Saves content at reasonable file names (e.g. page titles or content IDs) to help easily browse downloaded content.
• I've verified that this change did not break existing functionality (especially in the Ripper I modified).

Optional but recommended:

• I've added a unit test to cover my change.
  • Note: an issue of concern - I'm not clear on why the existing unit test didn't catch this issue in the first place. Maybe because it effectively did nothing and didn't fail.

[metaprime]

@soloturn This is my first time editing a ripper in years. I would appreciate you taking a look. Feel free to merge when ready.