Removed trailing whitespace from test_builtin.py

Author: tangyuan0821

Lib/test/test_builtin.py

@@ -1143,7 +1143,7 @@ def test_filter_deep_nesting_recursion_error(self):
         i = filter(bool, range(1000000))
         for _ in range(100000):
             i = filter(bool, i)
-        
+
         # Should raise RecursionError, not segmentation fault
         with self.assertRaises(RecursionError):
             list(i)