don't check that the first character is XID_Continue

Current, XID_Continue is a superset of XID_Start, but that may sometime change.
diff --git a/Lib/test/test_pep3131.py b/Lib/test/test_pep3131.py
index df0f64d..9a3c7ee 100644
--- a/Lib/test/test_pep3131.py
+++ b/Lib/test/test_pep3131.py
@@ -19,10 +19,7 @@
         𝔘𝔫𝔦𝔠𝔬𝔡𝔢 = 1
         # On wide builds, this is normalized, but on narrow ones it is not. See
         # #12746.
-        try:
-            self.assertIn("𝔘𝔫𝔦𝔠𝔬𝔡𝔢", dir())
-        except AssertionError:
-            raise unittest.case._ExpectedFailure(sys.exc_info())
+        self.assertIn("Unicode", dir())
 
     def test_invalid(self):
         try: