hypopt/model_selection.py: fix

[alllexx88]

X_val and y_val should be used directly instead of using (now undefined) job_params

[codecov]

Codecov Report

Merging #31 (0ad3388) into master (2c8e410) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #31   +/-   ##
=======================================
  Coverage   85.27%   85.27%           
=======================================
  Files           3        3           
  Lines         163      163           
=======================================
  Hits          139      139           
  Misses         24       24           

Impacted Files	Coverage Δ
hypopt/model_selection.py	85.00% <ø> (ø)

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