Don't underline indentation

[willmcgugan]

Prevent code highlights in exceptions from highlighting indentation. Previously indentation was underline, which didn't look good.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 56.00000% with 11 lines in your changes missing coverage. Please review.

Project coverage is 98.09%. Comparing base (225cb07) to head (47da97e).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
rich/traceback.py	56.00%	11 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3678      +/-   ##
==========================================
- Coverage   98.24%   98.09%   -0.16%     
==========================================
  Files          74       74              
  Lines        8105     8124      +19     
==========================================
+ Hits         7963     7969       +6     
- Misses        142      155      +13     

Flag	Coverage Δ
unittests	98.09% <56.00%> (-0.16%)	⬇️

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