Fix svg colorbars

[has2k1]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 57.89474% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.71%. Comparing base (598ba56) to head (e092608).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
plotnine/guides/guide_colorbar.py	38.46%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1023      +/-   ##
==========================================
- Coverage   86.75%   86.71%   -0.04%     
==========================================
  Files         198      198              
  Lines       13264    13277      +13     
  Branches     1650     1654       +4     
==========================================
+ Hits        11507    11513       +6     
- Misses       1214     1220       +6     
- Partials      543      544       +1     

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