Fix: Adapt to changes in PEtab test suite API

[dweindl]

Fix test.test_petab_suite:test_petab_suite.py:35 load_solution() missing 1 required positional argument: 'format'

Closes #507

[codecov-io]

Codecov Report

Merging #508 (3a94c58) into develop (a7439ae) will decrease coverage by 0.03%.
The diff coverage is 93.93%.

@@             Coverage Diff             @@
##           develop     #508      +/-   ##
===========================================
- Coverage    90.27%   90.24%   -0.04%     
===========================================
  Files           72       72              
  Lines         4289     4283       -6     
===========================================
- Hits          3872     3865       -7     
- Misses         417      418       +1     

Impacted Files	Coverage Δ
pypesto/visualize/misc.py	84.93% <50.00%> (-0.41%)	⬇️
pypesto/visualize/clust_color.py	91.25% <66.66%> (-1.06%)	⬇️
pypesto/optimize/optimizer.py	87.32% <100.00%> (+0.03%)	⬆️
pypesto/visualize/parameters.py	91.91% <100.00%> (ø)
pypesto/visualize/waterfall.py	93.82% <100.00%> (-2.77%)	⬇️
pypesto/engine/multi_process.py	92.30% <0.00%> (+7.69%)	⬆️

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