use zero computations form MatrixPencils

[baggepinnen]

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[JuliaControlBot]

This is an automated message.
Plots were compared to references. 1/11 images have changed, see differences below.
After pulling this PR, please update the reference images by creating a PR to ControlExamplePlots.jl here.

Difference	Reference Image	New Image
✔️ 0.006

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.28%. Comparing base (c1cf26a) to head (73713f1).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #972      +/-   ##
==========================================
- Coverage   92.60%   92.28%   -0.32%     
==========================================
  Files          41       41              
  Lines        4973     4911      -62     
==========================================
- Hits         4605     4532      -73     
- Misses        368      379      +11     

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