Fix sam_knn.py variable name for reset

[ginop]

As presented here, #272, SAMKNNClassifier cannot use the reset() method. This seems to be due to the name mismatch between internal variable self.max_wind_size and input argument max_window_size.

max_wind_size does not appear to be referenced anywhere else in the library, so simply editing the name to match max_window_size in SAMKNNClassifier.__init__() may be all the change that is needed to fix this.

Changes proposed in this pull request:

• Rename max_wind_size to max_window_size on all three uses in SAMKNNClassifier.__init__().
• Change expected_info in test_sam_knn_coverage to reflect corrected value for max_window_size
• Fixes [BUG] SAMKNNClassifier cannot be reset #272

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Checklist

Implementation

• Implementation is correct (it performs its intended function).
• Code is consistent with the framework.
• Code is properly documented.
• PR description covers ALL the changes performed.
• Files changed (update, add, delete) are in the PR's scope (no extra files are included).

Tests

• New functionality is tested.
• Tests are created for the new functionality or existing tests are updated accordingly.
• ALL tests pass with no errors.
• CI/CD pipelines run with no errors.
• Test Coverage is maintained (coverage may drop by no more than 0.2%).

[codecov]

Codecov Report

Merging #281 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #281   +/-   ##
=======================================
  Coverage   88.20%   88.20%           
=======================================
  Files         156      156           
  Lines       13013    13013           
=======================================
  Hits        11478    11478           
  Misses       1535     1535           

Impacted Files	Coverage Δ
src/skmultiflow/lazy/sam_knn.py	95.22% <100.00%> (ø)

[ginop]

No checks were failed, but two were canceled. As far as I can tell, this was not caused by the PR and the edited code does not need further changes. What should I do to resolve this?