Fix black formatting in snap_assets.py

[MaxGhenis]

Summary

• Fixes black formatting violation in snap_assets.py that was causing lint failures on unrelated PRs

Test plan

• Lint passes

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a443eab) to head (2f0596e).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7464   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         1    -1     
  Lines           27        10   -17     
=========================================
- Hits            27        10   -17     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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