Fix sparse y test

[eddiebergman]

Now correctly check and converts y_test if it's sparse

[codecov]

Codecov Report

Merging #1248 (3c7967f) into development (4597152) will decrease coverage by 0.12%.
The diff coverage is 81.88%.

@@               Coverage Diff               @@
##           development    #1248      +/-   ##
===============================================
- Coverage        88.19%   88.06%   -0.13%     
===============================================
  Files              138      140       +2     
  Lines            10866    11145     +279     
===============================================
+ Hits              9583     9815     +232     
- Misses            1283     1330      +47     

Impacted Files	Coverage Δ
autosklearn/data/feature_validator.py	97.50% <ø> (ø)
autosklearn/data/target_validator.py	97.08% <ø> (ø)
autosklearn/ensembles/abstract_ensemble.py	88.88% <0.00%> (ø)
autosklearn/evaluation/abstract_evaluator.py	92.91% <ø> (ø)
...osklearn/metalearning/metafeatures/metafeatures.py	94.59% <ø> (ø)
autosklearn/metrics/__init__.py	91.27% <ø> (+0.05%)	⬆️
autosklearn/pipeline/base.py	87.67% <ø> (+1.10%)	⬆️
autosklearn/pipeline/classification.py	86.61% <ø> (-0.28%)	⬇️
autosklearn/pipeline/components/base.py	78.78% <ø> (-0.38%)	⬇️
...arn/pipeline/components/classification/__init__.py	84.78% <ø> (ø)
... and 84 more

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