fix: used normalize_str in BaseTokenizer.normalize (#1884)

Author: ishitab02

bindings/python/py_src/tokenizers/implementations/base_tokenizer.py

@@ -187,7 +187,7 @@ def normalize(self, sequence: str) -> str:
         Returns:
             The normalized string
         """
-        return self._tokenizer.normalize(sequence)
+        return self._tokenizer.normalizer.normalize_str(sequence)
 
     def encode(
         self,