fix bug with coloring lines in multiline show_line

[amoodie]

fix bug with coloring lines in multiline show_line

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.47%. Comparing base (eca6de0) to head (dbb102b).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
pyDeltaRCM/debug_tools.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #323      +/-   ##
===========================================
- Coverage    91.47%   91.47%   -0.01%     
===========================================
  Files           12       12              
  Lines         2792     2791       -1     
===========================================
- Hits          2554     2553       -1     
  Misses         238      238              

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