Fixed: changed file format of a default cover from .jpg to .jpeg

[KirillBorodinskiy]

Description

This should resolve issue #635

Checklist

• Created tests which fail without the change (if possible)
• All tests passing
• Extended the documentation, if necessary

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.31%. Comparing base (948ce9f) to head (68bd7c4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #636   +/-   ##
=======================================
  Coverage   81.31%   81.31%           
=======================================
  Files         129      129           
  Lines       10013    10013           
=======================================
  Hits         8142     8142           
  Misses       1871     1871           

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[KirillBorodinskiy]

I am sorry, but I am not yet familiar with such a system of merging. When will those tests be marked as done?

[Rotheem]

I am sorry, but I am not yet familiar with such a system of merging. When will those tests be marked as done?

There seems to be an issue with 2 checks, we will ignore them