Handle in-line breaks in a math node that is an embellished operator in SVG output. (mathjax/MathJax#3587)

[dpvc]

This PR addresses a problem in SVG output for an inline math element that is an embellished operator. Such an operator should not have line breaks within it (unless they are explicit breaks), but the SVG output was processing them anyway. The fix is to skip the marking of in-line breaks when the math node is an embellished operator.

Resolves issue mathjax/MathJax#3587.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.46%. Comparing base (05c4055) to head (05cd69f).
⚠️ Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
ts/output/common.ts	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1524      +/-   ##
===========================================
- Coverage    86.47%   86.46%   -0.01%     
===========================================
  Files          340      340              
  Lines        86178    86181       +3     
  Branches      4856     4856              
===========================================
  Hits         74520    74520              
- Misses       11658    11661       +3     

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