refactor: clean up public calendar list item

[st3iny]

Follow-up to #6681

Remove some dead code from the public calendar list item component. It is not possible to toggle them and the method is not used anymore.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.02%. Comparing base (3b2d626) to head (7b81283).
Report is 7 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6694      +/-   ##
============================================
+ Coverage     23.00%   23.02%   +0.01%     
  Complexity      475      475              
============================================
  Files           252      252              
  Lines         12110    12101       -9     
  Branches       2311     2307       -4     
============================================
  Hits           2786     2786              
+ Misses         8998     8989       -9     
  Partials        326      326              

Flag	Coverage Δ
javascript	14.55% <ø> (+0.01%)	⬆️
php	59.30% <ø> (ø)

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