waterfall plot start indices fix

[plakrisenko]

No description provided.

[jvanhoefer]

if you merge this, before the new version is out, please enter this to the releasenote.rst before merging :)

[codecov-io]

Codecov Report

Merging #554 (ca793d6) into develop (ad2433b) will decrease coverage by 6.61%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #554      +/-   ##
===========================================
- Coverage    89.68%   83.06%   -6.62%     
===========================================
  Files           71       71              
  Lines         4536     4536              
===========================================
- Hits          4068     3768     -300     
- Misses         468      768     +300     

Impacted Files	Coverage Δ
pypesto/visualize/waterfall.py	96.29% <100.00%> (+2.46%)	⬆️
pypesto/petab/pysb_importer.py	0.00% <0.00%> (-100.00%)	⬇️
pypesto/prediction/amici_predictor.py	14.08% <0.00%> (-83.10%)	⬇️
pypesto/prediction/prediction.py	22.50% <0.00%> (-72.50%)	⬇️
pypesto/startpoint/util.py	50.00% <0.00%> (-35.00%)	⬇️
pypesto/optimize/optimizer.py	56.83% <0.00%> (-33.79%)	⬇️
pypesto/objective/amici_util.py	74.10% <0.00%> (-10.72%)	⬇️
pypesto/objective/amici_calculator.py	86.66% <0.00%> (-6.67%)	⬇️
pypesto/sample/pymc3.py	87.87% <0.00%> (-6.07%)	⬇️
pypesto/sample/theano.py	70.27% <0.00%> (-5.41%)	⬇️
... and 4 more

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