Replace non-breaking space with space in comment

Author: vstinner

Lib/test/test_capi/test_import.py

@@ -149,7 +149,7 @@ def check_frozen_import(self, import_frozen_module):
         try:
             self.assertEqual(import_frozen_module('zipimport'), 1)
 
-            # import zipimport again
+            # import zipimport again
             self.assertEqual(import_frozen_module('zipimport'), 1)
         finally:
             sys.modules['zipimport'] = old_zipimport