Python3StyleTest: run paren fixer

It was not running because we had two methods with same name

product/ERP5Type/tests/Python3StyleTest.py

@@ -96,7 +96,7 @@ class Python3StyleTest(ERP5TypeTestCase):
   def test_numliteralsFixApplied(self):
     self._testFixer('numliterals')
 
-  def test_numliteralsFixApplied(self):
+  def test_parenFixApplied(self):
     self._testFixer('paren')
 
   def test_raiseFixApplied(self):