Remove reference to deprecated numpy error class in tests (#3685)

Author: mwaskom

tests/test_distributions.py

@@ -1038,9 +1038,6 @@ def test_bandwidth(self, rng):
 
     def test_weights(self, rng):
 
-        import warnings
-        warnings.simplefilter("error", np.VisibleDeprecationWarning)
-
         n = 100
         x, y = rng.multivariate_normal([1, 3], [(.2, .5), (.5, 2)], n).T
         hue = np.repeat([0, 1], n // 2)