Fixed ensemble from optimization

[PaulJonasJost]

Noticed a mistake in the implementation, as x_names, ub, lb where from the full parameter vector, while the vectors from optimization only contain the non fixed. Adjusted it so that it is consistent with the optimization parameters.

[codecov-commenter]

Codecov Report

Merging #688 (fe7b45e) into develop (45e8a50) will increase coverage by 0.17%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #688      +/-   ##
===========================================
+ Coverage    90.18%   90.35%   +0.17%     
===========================================
  Files           96       96              
  Lines         6399     6400       +1     
===========================================
+ Hits          5771     5783      +12     
+ Misses         628      617      -11     

Impacted Files	Coverage Δ
pypesto/ensemble/ensemble.py	82.30% <100.00%> (+0.07%)	⬆️
pypesto/objective/amici_calculator.py	93.33% <0.00%> (+1.66%)	⬆️
pypesto/objective/amici_util.py	84.21% <0.00%> (+8.77%)	⬆️

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