Disable Tekstowo by default as they block requests with the beets UA

[catap]

Description

Mor or less Fixes #6337

To Do

• Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
• Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)
• Tests. (Very much encouraged but not strictly required.)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.15%. Comparing base (d65e37c) to head (1d8c378).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6344      +/-   ##
==========================================
+ Coverage   68.95%   69.15%   +0.19%     
==========================================
  Files         140      140              
  Lines       18685    18685              
  Branches     3058     3058              
==========================================
+ Hits        12885    12921      +36     
+ Misses       5153     5117      -36     
  Partials      647      647              

Files with missing lines	Coverage Δ
beetsplug/lyrics.py	85.12% <ø> (+7.43%)	⬆️

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