Fix RE Notebook for Issue 200

[dguittet]

Addresses issue:

#200

Summary/Motivation:

Changes proposed in this PR:

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (688999d) 89.76% compared to head (f28fc86) 89.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #211      +/-   ##
==========================================
- Coverage   89.76%   89.76%   -0.01%     
==========================================
  Files          74       74              
  Lines        8854     8853       -1     
==========================================
- Hits         7948     7947       -1     
  Misses        906      906              

Impacted Files	Coverage Δ
...bles_case/RE_surrogate_optimization_steadystate.py	91.51% <ø> (-0.06%)	⬇️
...tudies/renewables_case/tests/test_surrogate_opt.py	73.91% <ø> (ø)

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[lbianchi-lbl]

@dguittet I'm looking into the Linux "Notebooks checks" failures. They are very puzzling, as it looks like it's failing to find pytest plugins, and this is something I'd really not expect to be platform specific. I'll try to reproduce the error on a separate PR and keep you posted.

EDIT: these should have been addressed by #212.

[lbianchi-lbl]

I can confirm that all cells in the affected notebook are being run in CI, so we can be confident that the fixed version works (and therefore the last remaining item in #200 is resolved) .