Remove normal_direction_ll

[patrickersing]

This PR removes normal_direction_ll from the function signature of the nonconservative terms, to account for the changes in trixi-framework/Trixi.jl#2062.

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 81.50%. Comparing base (e5b40ad) to head (2430c7b).

Files with missing lines	Patch %	Lines
src/equations/shallow_water_wet_dry_2d.jl	0.00%	2 Missing ⚠️
src/equations/shallow_water_multilayer_2d.jl	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (e5b40ad) and HEAD (2430c7b). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (e5b40ad)	HEAD (2430c7b)
	5	3

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #58       +/-   ##
===========================================
- Coverage   99.27%   81.50%   -17.78%     
===========================================
  Files          61       61               
  Lines        2630     2563       -67     
===========================================
- Hits         2611     2089      -522     
- Misses         19      474      +455     

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