fix: Apply scale factors to the ratio plot in stack_ratio_plot

[matthewfeickert]

Resolves #76

* If `stack_ratio_plot` is given a `scale_factors` kwarg apply the scale factors to both the main plot as well as to the ratio plot
* In the dev-notebook reduce the rp_ylim for the stack_ratio_plot example to focus more

[codecov]

Codecov Report

Merging #78 (c9c1e68) into main (4de0427) will decrease coverage by 0.26%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #78      +/-   ##
==========================================
- Coverage   64.75%   64.48%   -0.27%     
==========================================
  Files           7        7              
  Lines         244      245       +1     
  Branches       41       42       +1     
==========================================
  Hits          158      158              
- Misses         63       64       +1     
  Partials       23       23              

Flag	Coverage Δ
unittests	64.48% <0.00%> (-0.27%)	⬇️

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Impacted Files	Coverage Δ
src/heputils/plot.py	62.14% <0.00%> (-0.30%)	⬇️

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