ui: drop unneeded int conversion in run_hang

[bdrung]

The method UserInterface.run_hang requires pid to be of type int.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 30.02%. Comparing base (e18ec92) to head (312cdcf).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
apport/ui.py	0.00%	3 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (e18ec92) and HEAD (312cdcf). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (e18ec92)	HEAD (312cdcf)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #443       +/-   ##
===========================================
- Coverage   83.60%   30.02%   -53.59%     
===========================================
  Files         101       85       -16     
  Lines       20451    19178     -1273     
  Branches     3219     2890      -329     
===========================================
- Hits        17098     5758    -11340     
- Misses       2858    12938    +10080     
+ Partials      495      482       -13     

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