Stop duplicating ensure_rng in AcquisitionFunction class

[Gerrit0]

I noticed this while porting the project to another environment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.92%. Comparing base (1714504) to head (f10aefb).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #561      +/-   ##
==========================================
- Coverage   97.92%   97.92%   -0.01%     
==========================================
  Files          10       10              
  Lines        1158     1155       -3     
==========================================
- Hits         1134     1131       -3     
  Misses         24       24              

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[till-m]

Thanks for the PR! Out of curiosity, what are you porting this project to, and why? :)

[Gerrit0]

I needed an implementation of it in C++ - didn't want to have to call Python in order to optimize things. It was super easy to get up and running with the library with a Python plugin, so it made sense to me to port the parts I needed to C++ rather than try and find some library in that language with the same API