Fix type error in test_re test code

Author: jirkamarsik

graalpython/com.oracle.graal.python.test/src/tests/test_re.py

@@ -85,7 +85,7 @@ def __getitem__(self, index):
 
 class B(bytes):
     def __getitem__(self, index):
-        return B(super().__getitem__(index))
+        return super().__getitem__(index)
 
 
 class ReTests(unittest.TestCase):