Remove redundant assignment in Catalog.__setitem__

[tomasr8]

AFAICT, this is a noop and can be removed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.31%. Comparing base (c2b397e) to head (caecef2).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1167      +/-   ##
==========================================
- Coverage   91.31%   91.31%   -0.01%     
==========================================
  Files          27       27              
  Lines        4654     4653       -1     
==========================================
- Hits         4250     4249       -1     
  Misses        404      404              

Flag	Coverage Δ
macos-14-3.10	90.32% <ø> (-0.01%)	⬇️
macos-14-3.11	90.26% <ø> (-0.01%)	⬇️
macos-14-3.12	90.47% <ø> (-0.01%)	⬇️
macos-14-3.13	90.47% <ø> (-0.01%)	⬇️
macos-14-3.8	90.19% <ø> (-0.01%)	⬇️
macos-14-3.9	90.25% <ø> (-0.01%)	⬇️
macos-14-pypy3.10	90.32% <ø> (-0.01%)	⬇️
ubuntu-24.04-3.10	90.35% <ø> (-0.01%)	⬇️
ubuntu-24.04-3.11	90.28% <ø> (-0.01%)	⬇️
ubuntu-24.04-3.12	90.50% <ø> (-0.01%)	⬇️
ubuntu-24.04-3.13	90.50% <ø> (-0.01%)	⬇️
ubuntu-24.04-3.8	90.21% <ø> (-0.01%)	⬇️
ubuntu-24.04-3.9	90.27% <ø> (-0.01%)	⬇️
ubuntu-24.04-pypy3.10	90.35% <ø> (-0.01%)	⬇️
windows-2022-3.10	90.36% <ø> (-0.01%)	⬇️
windows-2022-3.11	90.29% <ø> (-0.01%)	⬇️
windows-2022-3.12	90.51% <ø> (-0.01%)	⬇️
windows-2022-3.13	90.51% <ø> (-0.01%)	⬇️
windows-2022-3.8	90.33% <ø> (-0.01%)	⬇️
windows-2022-3.9	90.29% <ø> (-0.01%)	⬇️
windows-2022-pypy3.10	90.36% <ø> (-0.01%)	⬇️

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[akx]

So it is!