adapt AMR check for final step

[ranocha]

No description provided.

[sloede]

Thanks!

[codecov]

Codecov Report

Merging #325 (807e1e6) into dev (42bf494) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev     #325   +/-   ##
=======================================
  Coverage   88.33%   88.33%           
=======================================
  Files          87       87           
  Lines       13463    13463           
=======================================
  Hits        11892    11892           
  Misses       1571     1571           

Flag	Coverage Δ
unittests	88.33% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/callbacks/amr.jl	83.16% <100.00%> (ø)

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