Fix test that was not testing what it should

I corrected what I thought was a typo in a previous pep8 commit, but this change was also needed for the test to make sense.

Fix test that was not testing what it should
cb831893 · Pascal Lamblin · 6abfed52 · cb831893
--- a/theano/compile/tests/test_shared.py
+++ b/theano/compile/tests/test_shared.py
@@ -250,7 +250,7 @@ class Test_SharedVariable(unittest.TestCase):
        f(b, 8)
        assert b.get_value() == 8

-        b = shared(numpy.zeros((5, 5), dtype='float32'), allow_downcast=True)
+        b = shared(numpy.zeros((5, 5), dtype='float32'))
        self.assertRaises(TypeError, f, b, numpy.random.rand(5, 5))

    def test_tensor_floatX(self):
@@ -303,6 +303,5 @@ class Test_SharedVariable(unittest.TestCase):
        f(b, [8])
        assert b.get_value() == 8

-        b = shared(numpy.zeros((5, 5), dtype='float32'),
-                allow_downcast=True)
+        b = shared(numpy.zeros((5, 5), dtype='float32'))
        self.assertRaises(TypeError, f, b, numpy.random.rand(5, 5))