MNT fix flake 8 errors introduced in previous PR (scikit-learn#13292)

Author: albertcthomas

sklearn/ensemble/tests/test_iforest.py

@@ -10,7 +10,6 @@
 
 import numpy as np
 
-from sklearn.utils.testing import assert_almost_equal
 from sklearn.utils.testing import assert_array_equal
 from sklearn.utils.testing import assert_array_almost_equal
 from sklearn.utils.testing import assert_raises
@@ -280,7 +279,6 @@ def test_iforest_average_path_length():
     assert_array_equal(avg_path_length, np.sort(avg_path_length))
 
 
-
 @pytest.mark.filterwarnings('ignore:default contamination')
 @pytest.mark.filterwarnings('ignore:behaviour="old"')
 def test_score_samples():