Fix scaling issue in screening code

[loganbvh]

No description provided.

[codecov]

Codecov Report

Merging #37 (384b95d) into main (c7d75dc) will increase coverage by 0.05%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
+ Coverage   89.33%   89.39%   +0.05%     
==========================================
  Files          35       35              
  Lines        3808     3810       +2     
==========================================
+ Hits         3402     3406       +4     
+ Misses        406      404       -2     

Files Changed	Coverage Δ
tdgl/solution/solution.py	88.28% <ø> (ø)
tdgl/visualization/io.py	96.96% <ø> (ø)
tdgl/solver/solve.py	75.81% <81.25%> (+0.53%)	⬆️
tdgl/finite_volume/mesh.py	95.45% <100.00%> (ø)
tdgl/version.py	85.71% <100.00%> (ø)

... and 1 file with indirect coverage changes