Use @test_trixi_include for some upwind tests

[JoshuaLampert]

Before we rewrote the testing mechanism again in the cases where we wanted to reuse an elixir, but exchange the solver in the tests (to test upwind solvers). We could, however, simply reuse @test_trixi_include by passing the kwarg solver to reach the same, but being shorter, more readable and more consistent. I don't remember why I didn't opt for this solution in the first place.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.97%. Comparing base (824298a) to head (ddcce93).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #156   +/-   ##
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  Coverage   97.97%   97.97%           
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  Files          19       19           
  Lines        1776     1776           
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  Hits         1740     1740           
  Misses         36       36           

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