bpo-19113: Remove unused test_errors from ctypes tests (GH-28008)

bpo-19113: Remove unused test_errors from ctypes tests (GH-28008) · python/cpython@a561005

Original file line number	Diff line number	Diff line change
`@@ -209,15 +209,6 @@ def test_pointers(self):`
`209`	`209`	`result = f(byref(c_int(99)))`
`210`	`210`	`self.assertNotEqual(result.contents, 99)`
`211`	`211`
`212`		`-def test_errors(self):`
`213`		`-f = dll._testfunc_p_p`
`214`		`-f.restype = c_int`
`215`		`-`
`216`		`-class X(Structure):`
`217`		`-_fields_ = [("y", c_int)]`
`218`		`-`
`219`		`-self.assertRaises(TypeError, f, X()) #cannot convert parameter`
`220`		`-`
`221`	`212`	`################################################################`
`222`	`213`	`def test_shorts(self):`
`223`	`214`	`f = dll._testfunc_callback_i_if`