fix: legacy library link

[rpenido]

Description

This PR fixes the link from the cards on the legacy libraries list page.

Testing instructions

1. Open the legacy libraries list
   
2. Click on one library and check if you got redirected

[openedx-webhooks]

Thanks for the pull request, @rpenido!

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[bradenmacdonald]

Looks good, and fixes the bug! Thanks. Please open a backport PR too.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.93%. Comparing base (a0f6f43) to head (9498421).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1548   +/-   ##
=======================================
  Coverage   92.93%   92.93%           
=======================================
  Files        1073     1073           
  Lines       21093    21093           
  Branches     4546     4546           
=======================================
  Hits        19603    19603           
  Misses       1418     1418           
  Partials       72       72           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[rpenido]

Looks good, and fixes the bug! Thanks. Please open a backport PR too.

@bradenmacdonald I tested, and it doesn't seem to affect Sumac (the bug was inserted after the cut).
Could you double-check it?

[bradenmacdonald]

@rpenido Ah, you're right :)