Remove AMR CB from HLLE 2D Tree test

[DanielDoehring]

We see slight deviations for the HLLE 2D Tree test
https://github.com/trixi-framework/Trixi.jl/actions/runs/6795610704/job/18474033572?pr=1708#step:7:5482
which I cannot reproduce on my local machine. Removing the AMR CB hopefully resolves this.

[github-actions]

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[DanielDoehring]

Seems to work: https://github.com/trixi-framework/Trixi.jl/actions/runs/6796045292/job/18475339338?pr=1720#step:7:6339

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9acaa90) 83.00% compared to head (40b3b68) 77.39%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1720      +/-   ##
==========================================
- Coverage   83.00%   77.39%   -5.61%     
==========================================
  Files         431      431              
  Lines       34665    34624      -41     
==========================================
- Hits        28772    26797    -1975     
- Misses       5893     7827    +1934     

Flag	Coverage Δ
unittests	77.39% <ø> (-5.61%)	⬇️

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see 38 files with indirect coverage changes

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[ranocha]

Thanks!