logistic: Removing unused n_jobs arg from LogisticClassifier

[strayMat]

Small fix to remove useless n_jobs from LR classifier.

closes #1740

[jteijema]

n_jobsint, default=None

 Number of CPU cores used when parallelizing over classes if multi_class=’ovr’”. 
This parameter is ignored when the solver is set to ‘liblinear’ regardless of whether
 ‘multi_class’ is specified or not.

Good catch by @strayMat

[J535D165]

Thanks!