Remove unneeded duplicate check for pydantic v1 since we are already checking that in the else block. (#2467)

* Remove unneeded duplicate check for pydantic v1 since we are already in
the else block.

* fix formatting

autogen/_pydantic.py

@@ -64,7 +64,7 @@ else:  # pragma: no cover
         Returns:
             JsonSchemaValue: The JSON schema
         """
-        if PYDANTIC_V1:
+
         if t is None:
             return {"type": "null"}
         elif get_origin(t) is Union:
@@ -77,7 +77,7 @@ else:  # pragma: no cover
                 "prefixItems": prefixItems,
                 "type": "array",
             }
-
+        else:
             d = schema_of(t)
             if "title" in d:
                 d.pop("title")