Fix minor printing error in sprint_statistics.

[ahn1340]

Fixes #420 .

[codecov-io]

Codecov Report

Merging #478 into development will decrease coverage by 0.02%.
The diff coverage is 0%.

@@               Coverage Diff               @@
##           development     #478      +/-   ##
===============================================
- Coverage        78.59%   78.56%   -0.03%     
===============================================
  Files              130      130              
  Lines            10088    10088              
===============================================
- Hits              7929     7926       -3     
- Misses            2159     2162       +3

Impacted Files	Coverage Δ
autosklearn/automl.py	81.19% <0%> (ø)	⬆️
...e/components/feature_preprocessing/select_rates.py	83.07% <0%> (-3.08%)	⬇️
..._preprocessing/select_percentile_classification.py	87.93% <0%> (-1.73%)	⬇️
autosklearn/pipeline/implementations/xgb.py	83.33% <0%> (-0.56%)	⬇️
...ine/components/feature_preprocessing/kernel_pca.py	96.49% <0%> (+1.75%)	⬆️

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