[stable4.5] fix(appointments): Write Talk link to event

[backportbot-nextcloud]

Backport of #5573

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a4b6abf) 22.31% compared to head (cd5c556) 22.31%.
Report is 3 commits behind head on stable4.5.

Additional details and impacted files

@@             Coverage Diff              @@
##             stable4.5    #5575   +/-   ##
============================================
  Coverage        22.31%   22.31%           
  Complexity         406      406           
============================================
  Files              241      241           
  Lines            11821    11821           
  Branches          2296     2296           
============================================
  Hits              2638     2638           
  Misses            9183     9183           

Flag	Coverage Δ
javascript	13.86% <ø> (ø)
php	62.34% <ø> (ø)

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