feat(burgers-equation): example improvements

[WojciechNeuman]

Resolves #591

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.69%. Comparing base (84ad71b) to head (9ae5969).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #602   +/-   ##
=======================================
  Coverage   92.69%   92.69%           
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  Files          39       39           
  Lines        1697     1697           
=======================================
  Hits         1573     1573           
  Misses        124      124           

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[slayoo]

Resolves #591

Thanks @WojciechNeuman
This removes the .copy() call, but no other files were committed to this branch.

It would be great to add to the notebook plots simulation output obtained with only the basic UPWIND scheme - to highlight if using MPDATA is indeed worth the cost here.