Set OptimizerResult.optimizer in Optimizer.minimize

[dweindl]

Fixes #1524.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.80%. Comparing base (6eb4245) to head (31654ae).

Files with missing lines	Patch %	Lines
pypesto/optimize/optimizer.py	66.66%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1525      +/-   ##
===========================================
- Coverage    82.83%   82.80%   -0.04%     
===========================================
  Files          163      163              
  Lines        13962    13960       -2     
===========================================
- Hits         11565    11559       -6     
- Misses        2397     2401       +4     

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