runfix: set creation message timestamp to 0 after clearing content

[PatrykBuniX]

Description

When clearing a conversation content we should set conversation creation message's timestamp to 0 instead of the current date. When it was set to a current date, and we've imported a backup, creation message would appear as the most recent message (See screenshots below).

Screenshots/Screencast (for UI changes)

Before

After

Checklist

• PR has been self reviewed by the author;
• Hard-to-understand areas of the code have been commented;
• If it is a core feature, unit tests have been added;

Important details for the reviewers

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[PatrykBuniX]

This is the actual fix, 0 is a default timestamp param for .addCreationMessage method.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cd84402) 45.42% compared to head (aa803f6) 45.43%.
Report is 2 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #16549   +/-   ##
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  Coverage   45.42%   45.43%           
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  Files         740      740           
  Lines       24238    24239    +1     
  Branches     5506     5506           
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+ Hits        11011    11013    +2     
  Misses      11818    11818           
+ Partials     1409     1408    -1