fix: use log probs for KNNClassifier.predict_log_proba

[eonu]

Description

Was incorrectly using np.log(self.predict_scores(...)) instead of np.log(self.predict_probs(...)).

Fixes #246.

Checklist

• I have added new tests (if necessary).
• I have ensured that tests and coverage are passing on CI.
• I have updated any relevant documentation (if necessary).
• I have used a descriptive pull request title.

[coveralls]

Pull Request Test Coverage Report for Build be2981b0-22b1-442d-a820-3461aa7c2492

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.634%

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Totals
Change from base Build 2a88cd07-c9dc-446b-b920-fd6bb88ff346:	0.0%
Covered Lines:	2187
Relevant Lines:	2413

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💛 - Coveralls