fix(table): highlight columns added by add_row

[TomJGooding]

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Fixes #3517. The default value for the Column.highlight is False, so where necessary columns are added by the add_row method this should default to the Table.highlight value.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.25%. Comparing base (9c74f03) to head (16b3830).
Report is 110 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3518   +/-   ##
=======================================
  Coverage   98.25%   98.25%           
=======================================
  Files          74       74           
  Lines        8072     8098   +26     
=======================================
+ Hits         7931     7957   +26     
  Misses        141      141           

Flag	Coverage Δ
unittests	98.25% <100.00%> (+<0.01%)	⬆️

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[willmcgugan]

LGTM Thanks Tom!