[stable4.5] fix(appointments): Make rooms public

[backportbot-nextcloud]

Backport of #5516

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (e4bc804) 22.30% compared to head (d0ae16d) 22.30%.
Report is 1 commits behind head on stable4.5.

Additional details and impacted files

@@             Coverage Diff              @@
##             stable4.5    #5534   +/-   ##
============================================
  Coverage        22.30%   22.30%           
  Complexity         388      388           
============================================
  Files              240      240           
  Lines            11764    11764           
  Branches          2294     2294           
============================================
  Hits              2624     2624           
  Misses            9140     9140           

Flag	Coverage Δ
javascript	13.86% <ø> (ø)
php	63.25% <ø> (ø)

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