Fix SWME flux function

[patrickersing]

This fixes a bug in the flux function for the ShallowWaterMomentEquations, which was missing a multiplication by the water height h.

This should have been covered by unit testing, but since we chose u = SVector(1.0, 0.3, 0.15, 0.15, 0.1), the test did not fail. I have changed the test values to avoid this problem.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.47%. Comparing base (58fc7b9) to head (1fd055e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #161   +/-   ##
=======================================
  Coverage   97.47%   97.47%           
=======================================
  Files         105      105           
  Lines        5565     5565           
=======================================
  Hits         5424     5424           
  Misses        141      141           

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[patrickersing]

The coveralls upload is currently failing on MacOS. This should get fixed in #162.

[andrewwinters5000]

Thanks for catching this!