[stable4.5] fix(dashboard): properly handle recurring events

[backportbot-nextcloud]

Backport of #5486

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (7b2c8c7) 22.64% compared to head (0bed42b) 22.69%.
Report is 1 commits behind head on stable4.5.

Additional details and impacted files

@@               Coverage Diff               @@
##             stable4.5    #5497      +/-   ##
===============================================
+ Coverage        22.64%   22.69%   +0.05%     
- Complexity         395      397       +2     
===============================================
  Files              241      241              
  Lines            11830    11839       +9     
  Branches          2299     2299              
===============================================
+ Hits              2679     2687       +8     
- Misses            9151     9152       +1     

Flag	Coverage Δ
javascript	13.84% <ø> (ø)
php	64.36% <ø> (+0.10%)	⬆️

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see 2 files with indirect coverage changes

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