[stable3.5] fix: sidebar editor subtitle not respecting event's timezone

[backportbot-nextcloud]

• ⚠️ This backport had conflicts that were resolved with the 'ours' merge strategy and is likely incomplete

backport of #5101

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02 ⚠️

Comparison is base (3148cb1) 20.32% compared to head (db48d61) 20.30%.

Additional details and impacted files

@@              Coverage Diff              @@
##           stable3.5    #5103      +/-   ##
=============================================
- Coverage      20.32%   20.30%   -0.02%     
=============================================
  Files            186      186              
  Lines           6333     6337       +4     
  Branches        1032     1032              
=============================================
  Hits            1287     1287              
- Misses          5046     5050       +4     

Flag	Coverage Δ
javascript	20.30% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/views/EditSidebar.vue	0.00% <0.00%> (ø)

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[st3iny]

I solved conflicts, tested and it works fine.