tweak computation of integrator excess

[baggepinnen]

to handle new difficult test case

[JuliaControlBot]

This is an automated message.
Plots were compared to references. No changes were detected.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review.

Project coverage is 92.83%. Comparing base (b644a5d) to head (57e4629).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ControlSystemsBase/src/ControlSystemsBase.jl	0.00%	2 Missing ⚠️
lib/ControlSystemsBase/src/analysis.jl	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #970      +/-   ##
==========================================
- Coverage   92.86%   92.83%   -0.04%     
==========================================
  Files          41       41              
  Lines        5005     5007       +2     
==========================================
  Hits         4648     4648              
- Misses        357      359       +2     

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