wrappers_test.py quick fix for flaky TimeDistributed test (#7062)

full issue: https://github.com/fchollet/keras/pull/7033

tests/keras/layers/wrappers_test.py

@@ -93,11 +93,12 @@ def test_TimeDistributed():
                     reason='cntk does not support dropout yet')
 def test_TimeDistributed_learning_phase():
     # test layers that need learning_phase to be set
+    np.random.seed(1234)
     x = Input(shape=(3, 2))
     y = wrappers.TimeDistributed(core.Dropout(.999))(x, training=True)
     model = Model(x, y)
     y = model.predict(np.random.random((10, 3, 2)))
-    assert_allclose(0., y, atol=1e-2)
+    assert_allclose(np.mean(y), 0., atol=1e-1, rtol=1e-1)
 
 
 @keras_test