fix!: thick discs only receive projected radius

[fjebaker]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 86.20% and project coverage change: +0.06% 🎉

Comparison is base (9f3e2bf) 69.27% compared to head (334ad20) 69.34%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   69.27%   69.34%   +0.06%     
==========================================
  Files          66       66              
  Lines        2734     2730       -4     
==========================================
- Hits         1894     1893       -1     
+ Misses        840      837       -3     

Files Changed	Coverage Δ
src/geometry/discs.jl	0.00% <ø> (-4.55%)	⬇️
src/tracing/precision-solvers.jl	69.44% <50.00%> (ø)
src/geometry/discs/datum-plane.jl	77.77% <66.66%> (+14.14%)	⬆️
src/geometry/discs/thick-disc.jl	80.00% <81.81%> (+1.42%)	⬆️
src/geometry/discs/polish-doughnut.jl	100.00% <100.00%> (ø)
src/geometry/discs/shakura-sunyaev.jl	91.66% <100.00%> (-0.65%)	⬇️
...ransfer-functions/cunningham-transfer-functions.jl	97.29% <100.00%> (ø)
src/utils.jl	40.98% <100.00%> (+4.14%)	⬆️

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