move plot kwargs to a place where they'll have effect

[baggepinnen]

Plots bug workaround

[JuliaControlBot]

Something failed when generating plots. See the log at https://github.com/JuliaControl/ControlExamplePlots.jl/actions/runs/1607233928?check_suite_focus=true for more details.

[codecov]

Codecov Report

Merging #582 (c9302a3) into master (aeff202) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #582   +/-   ##
=======================================
  Coverage   84.49%   84.49%           
=======================================
  Files          31       31           
  Lines        3179     3179           
=======================================
  Hits         2686     2686           
  Misses        493      493           

Impacted Files	Coverage Δ
src/plotting.jl	77.14% <100.00%> (ø)

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