fix: ATLAS beampipe radius in itk.py

[timadye]

Fixes #1144 for ATLAS geometry created by itk.py's buildITkGeometry.

[codecov]

Codecov Report

Merging #1157 (d37001b) into main (5220f82) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1157   +/-   ##
=======================================
  Coverage   47.90%   47.90%           
=======================================
  Files         359      359           
  Lines       18491    18491           
  Branches     8723     8723           
=======================================
  Hits         8859     8859           
  Misses       3603     3603           
  Partials     6029     6029           

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