tracefem test working

[ConnorMallon]

fix the test to reflect new api.

[codecov-commenter]

Codecov Report

Merging #58 (beed5a5) into gridap_v0.17 (554a225) will decrease coverage by 0.04%.
The diff coverage is 50.00%.

@@               Coverage Diff                @@
##           gridap_v0.17      #58      +/-   ##
================================================
- Coverage         87.03%   86.98%   -0.05%     
================================================
  Files                15       15              
  Lines              1789     1790       +1     
================================================
  Hits               1557     1557              
- Misses              232      233       +1     

Impacted Files	Coverage Δ
src/Interfaces/EmbeddedDiscretizations.jl	79.61% <50.00%> (-0.31%)	⬇️

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