Fix: list hidden shared calendars correctly

[hamza221]

Fixes #6259

b	a

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.60%. Comparing base (d97533d) to head (151e27a).
Report is 12 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6261      +/-   ##
============================================
+ Coverage     23.89%   29.60%   +5.71%     
- Complexity      454      908     +454     
============================================
  Files           246      287      +41     
  Lines         11651    13884    +2233     
  Branches       2199     2188      -11     
============================================
+ Hits           2784     4111    +1327     
- Misses         8551     9458     +907     
+ Partials        316      315       -1     

Flag	Coverage Δ
javascript	15.45% <ø> (-0.01%)	⬇️
php	59.53% <ø> (ø)

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[miaulalala]

/backport to stable5.0