Fix bug in decoding RetrieveScheduleResponse

[allenporter]

Fixes a bug decoding an integer in the wrong base. Currently able to reproduce when using a rain delay above 10:

Unexpected error fetching x.x.x.x Schedule data: invalid literal for int() with base 10: '0E'
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/update_coordinator.py", line 313, in _async_refresh
    self.data = await self._async_update_data()
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/rainbird/coordinator.py", line 150, in _async_update_data
    return await self._controller.get_schedule()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyrainbird/async_client.py", line 428, in get_schedule
    result = await self._process_command(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyrainbird/async_client.py", line 489, in _process_command
    decoded = rainbird.decode(decrypted_data)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyrainbird/rainbird.py", line 187, in decode
    return {TYPE: cmd_template[TYPE], **decoder(data, cmd_template)}
                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/pyrainbird/rainbird.py", line 45, in decode_schedule
    "rainDelay": int(rest[4:6]),
                 ^^^^^^^^^^^^^^
ValueError: invalid literal for int() with base 10: '0E'