Fix loading of lyrics from lyrics.wikia.com

Summary:
Fix error where Amarok failed to load lyrics from lyrics.wikia.com because the domain was being redirected to lyrics.fandom.com.

The fix does two things:

• update the base API Url to the redirected domain lyrics.fandom.com, thus skipping the redirection
• makes LyricsManager react to possible future redirections

Reviewers: Amarok, amarok-devel, heikobecker

Reviewed By: Amarok, heikobecker

Subscribers: Amarok, pgomes, amarok-devel

BUG: 417259

Differential Revision: https://phabricator.kde.org/D27369