fix #909

[baggepinnen]

No description provided.

[JuliaControlBot]

This is an automated message.
Plots were compared to references. 11/11 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
❌ 0.047
✔️ 0.011
✔️ 0.001
✔️ 0.001
✔️ 0.007
✔️ 0.003
✔️ 0.0
⚠️ 0.028
❌ 0.06
✔️ 0.0
⚠️ 0.017

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7c86b31) 92.84% compared to head (de5e295) 92.85%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #910   +/-   ##
=======================================
  Coverage   92.84%   92.85%           
=======================================
  Files          43       43           
  Lines        4811     4813    +2     
=======================================
+ Hits         4467     4469    +2     
  Misses        344      344           

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