Fix a typo in code module test (python#130530)

Author: gaogaotiantian

Lib/test/test_code_module.py

@@ -50,9 +50,9 @@ def test_ps2(self):
         self.infunc.side_effect = EOFError('Finished')
         self.console.interact()
         self.assertEqual(self.sysmod.ps2, '... ')
-        self.sysmod.ps1 = 'custom2> '
+        self.sysmod.ps2 = 'custom2> '
         self.console.interact()
-        self.assertEqual(self.sysmod.ps1, 'custom2> ')
+        self.assertEqual(self.sysmod.ps2, 'custom2> ')
 
     def test_console_stderr(self):
         self.infunc.side_effect = ["'antioch'", "", EOFError('Finished')]