fix returned transformation matrix

[baggepinnen]

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[JuliaControlBot]

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Plots were compared to references. 11/11 images have changed, see differences below.
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Difference	Reference Image	New Image
✔️ 0.005
❌ 0.058
⚠️ 0.016
✔️ 0.0
❌ 0.037
❌ 0.034
⚠️ 0.022
✔️ 0.004
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✔️ 0.0
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[codecov]

Codecov Report

Merging #602 (cf63f75) into master (77f5759) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #602   +/-   ##
=======================================
  Coverage   85.70%   85.70%           
=======================================
  Files          31       31           
  Lines        3225     3226    +1     
=======================================
+ Hits         2764     2765    +1     
  Misses        461      461           

Impacted Files	Coverage Δ
src/matrix_comps.jl	93.07% <100.00%> (+0.02%)	⬆️

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