cockpit: start the Borg runner after all widgets are mounted

[ThomasWaldmann]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.83%. Comparing base (4073bb2) to head (dfa9308).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/borg/cockpit/app.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9278      +/-   ##
==========================================
- Coverage   75.84%   75.83%   -0.02%     
==========================================
  Files          86       86              
  Lines       14745    14747       +2     
  Branches     2194     2194              
==========================================
  Hits        11184    11184              
- Misses       2888     2890       +2     
  Partials      673      673              

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