Update .clang-format

[yshui]

And reformat the existing code

Holding off to not interfere with existing important PRs.

[codecov]

Codecov Report

Attention: Patch coverage is 85.10638% with 7 lines in your changes missing coverage. Please review.

Project coverage is 37.46%. Comparing base (24f0241) to head (01e6d68).
Report is 1303 commits behind head on next.

Files with missing lines	Patch %	Lines
src/picom.c	85.10%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #467      +/-   ##
==========================================
+ Coverage   37.43%   37.46%   +0.03%     
==========================================
  Files          45       45              
  Lines        8671     8671              
==========================================
+ Hits         3246     3249       +3     
+ Misses       5425     5422       -3     

Files with missing lines	Coverage Δ
src/picom.c	68.36% <85.10%> (+0.28%)	⬆️

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