fix: deepcopy exception in ColorSchemePre

[linrongbin16]

No description provided.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e6903c0) 48.11% compared to head (c64d279) 48.29%.
Report is 1 commits behind head on main.

❗ Current head c64d279 differs from pull request most recent head 996bf46. Consider uploading reports for the commit 996bf46 to get more accurate results

Files	Patch %	Lines
lua/colorbox.lua	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
+ Coverage   48.11%   48.29%   +0.18%     
==========================================
  Files           2        2              
  Lines         530      528       -2     
==========================================
  Hits          255      255              
+ Misses        275      273       -2     

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