Fix predict_proba for classifer

[mabryj2]

Closes #409

[codecov-io]

Codecov Report

Merging #411 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #411      +/-   ##
==========================================
- Coverage   75.09%   75.08%   -0.02%     
==========================================
  Files         131      131              
  Lines        9750     9752       +2     
==========================================
  Hits         7322     7322              
- Misses       2428     2430       +2

Impacted Files	Coverage Δ
autosklearn/estimators.py	92.68% <100%> (+1.43%)	⬆️
autosklearn/automl.py	80.92% <100%> (+0.19%)	⬆️
...n/pipeline/components/classification/libsvm_svc.py	89.74% <0%> (-3.85%)	⬇️
...peline/components/classification/multinomial_nb.py	89.47% <0%> (-2.64%)	⬇️
..._preprocessing/select_percentile_classification.py	86.2% <0%> (-1.73%)	⬇️
...ipeline/components/classification/random_forest.py	95.4% <0%> (+1.14%)	⬆️
...e/components/feature_preprocessing/select_rates.py	85.93% <0%> (+1.56%)	⬆️

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[mfeurer]

Thanks a lot!