Fix update_folders method

[Danipulok]

What this PR does?

Updates update_folders method to make it work (currently, it fails).

MRE:

import asyncio

from pyrogram import Client, raw


async def main() -> None:
    client = Client(
        name="account",
        api_id=8,
        api_hash="7245de8e747a0d6fbe11f7cc14fcc0bb",
    )

    await client.start()

    await client.update_folder(
        folder_id=13,
        title="NEW_NAME",
        included_chats=["me"],
    )

    await client.stop()


if __name__ == "__main__":
    loop = asyncio.new_event_loop()
    loop.run_until_complete(main())

Current traceback:

Traceback (most recent call last):
  File "D:\Code\Personal\pyrogram\mre.py", line 35, in <module>
    loop.run_until_complete(main())
  File "C:\Program Files\Python312\Lib\asyncio\base_events.py", line 687, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "D:\Code\Personal\pyrogram\mre.py", line 25, in main
    await client.update_folder(
  File "D:\Code\Personal\pyrogram\.venv\Lib\site-packages\pyrogram\methods\chats\update_folder.py", line 116, in update_folder
    r = await self.invoke(
        ^^^^^^^^^^^^^^^^^^
  File "D:\Code\Personal\pyrogram\.venv\Lib\site-packages\pyrogram\methods\advanced\invoke.py", line 94, in invoke
    r = await session.invoke(
        ^^^^^^^^^^^^^^^^^^^^^
  File "D:\Code\Personal\pyrogram\.venv\Lib\site-packages\pyrogram\session\session.py", line 406, in invoke
    return await self.send(query, timeout=timeout)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Code\Personal\pyrogram\.venv\Lib\site-packages\pyrogram\session\session.py", line 335, in send
    message = self.msg_factory(data)
              ^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Code\Personal\pyrogram\.venv\Lib\site-packages\pyrogram\session\internals\msg_factory.py", line 37, in __call__
    len(body)
  File "D:\Code\Personal\pyrogram\.venv\Lib\site-packages\pyrogram\raw\core\tl_object.py", line 79, in __len__
    return len(self.write())
               ^^^^^^^^^^^^
  File "D:\Code\Personal\pyrogram\.venv\Lib\site-packages\pyrogram\raw\functions\messages\update_dialog_filter.py", line 82, in write
    b.write(self.filter.write())
            ^^^^^^^^^^^^^^^^^^^
  File "D:\Code\Personal\pyrogram\.venv\Lib\site-packages\pyrogram\raw\types\dialog_filter.py", line 164, in write
    b.write(self.title.write())
            ^^^^^^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'write'

New behavior:

Process finished with exit code 0