Clear the SVG stylesheet during reset.

[dpvc]

This PR adds a line to the SVG output jax's reset() function, so that the stylesheet will be regenerated after a reset. This helps support reusing the SVG output jax in sequentially created math documents (so that in the second document, the SVG output jax doesn't think it already has a stylesheet in place)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.70%. Comparing base (9ef060f) to head (a1ec0f4).

Files with missing lines	Patch %	Lines
ts/output/svg.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1533      +/-   ##
===========================================
- Coverage    86.70%   86.70%   -0.01%     
===========================================
  Files          340      340              
  Lines        86264    86265       +1     
  Branches      3246     3246              
===========================================
  Hits         74798    74798              
- Misses       11466    11467       +1     

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