Drop seemingly wrong test line that throws an AttributeError.

--- pyPEG2-2.15.1/pypeg2/test/test_pyPEG2.py
+++ pyPEG2-2.15.1/pypeg2/test/test_pyPEG2.py
@@ -255,7 +255,6 @@
     def runTest(self):
         r = pypeg2.parse("!all", type(self).C1)
         self.assertEqual(str(r), "all")
-        self.assertEqual(r._ignore1, None)
 
 class ParseOmitTestCase(ParserTestCase):
     def runTest(self):