fix: default parameter value inconsistent from doc

[zerolfx]

What does this implement/fix? Explain your changes.

The default value of min_samples_leaf in BalancedRandomForestClassifier constructor is 2, but in doc, the default value is 1.

Any other comments?

This default value in RandomForestClassifier(sklearn) is also 1.

[glemaitre]

LGTM thanks for catching this.

[codecov]

Codecov Report

Merging #711 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #711   +/-   ##
=======================================
  Coverage   96.37%   96.37%           
=======================================
  Files          82       82           
  Lines        4989     4989           
=======================================
  Hits         4808     4808           
  Misses        181      181           

Impacted Files	Coverage Δ
imblearn/ensemble/_forest.py	97.26% <ø> (ø)
imblearn/ensemble/tests/test_forest.py	100.00% <ø> (ø)
imblearn/over_sampling/_smote.py	97.22% <ø> (ø)
imblearn/pipeline.py	93.93% <ø> (ø)
...mpling/_prototype_generation/_cluster_centroids.py	100.00% <ø> (ø)

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