Fix execution of multiple event assignments from the same event

[dweindl]

Fixes #2430

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.41%. Comparing base (41d19bb) to head (5d72df0).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2431      +/-   ##
===========================================
- Coverage    77.65%   73.41%   -4.24%     
===========================================
  Files          324      319       -5     
  Lines        20915    20748     -167     
  Branches      1464     1443      -21     
===========================================
- Hits         16241    15233    -1008     
- Misses        4671     5511     +840     
- Partials         3        4       +1     

Flag	Coverage Δ
cpp	73.41% <100.00%> (-0.02%)	⬇️
cpp_python	?
petab	?
python	69.84% <100.00%> (-2.35%)	⬇️

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Files	Coverage Δ
python/sdist/amici/sbml_import.py	78.58% <100.00%> (-1.15%)	⬇️

... and 29 files with indirect coverage changes

[dweindl]

Invalid. See #2430 (comment)