Fix URL encoding in Google Calendar link

[qwandor]

Fixes #507.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.29%. Comparing base (fed274c) to head (b69d940).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #508      +/-   ##
==========================================
+ Coverage   29.18%   29.29%   +0.10%     
==========================================
  Files          40       40              
  Lines        5178     5186       +8     
  Branches     5178     5186       +8     
==========================================
+ Hits         1511     1519       +8     
  Misses       3632     3632              
  Partials       35       35              

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