[stable5.1] fix: sort talk conversations by most recent activity

[backportbot]

Backport of PR #6677

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 14.53%. Comparing base (8f9d4ca) to head (0418668).
Report is 6 commits behind head on stable5.1.

Files with missing lines	Patch %	Lines
src/components/Editor/AddTalkModal.vue	0.00%	4 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           stable5.1    #6678      +/-   ##
=============================================
- Coverage      14.54%   14.53%   -0.01%     
=============================================
  Files            210      210              
  Lines           9820     9822       +2     
  Branches        2299     2310      +11     
=============================================
  Hits            1428     1428              
- Misses          8065     8067       +2     
  Partials         327      327              

Flag	Coverage Δ
javascript	14.53% <0.00%> (-0.01%)	⬇️

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