Fixes logging when passing multiple objects

[ibraheem-abe]

When passing multiple objects, the logger breaks in the current implementation due to the check in the current _concat_message.

Traceback (most recent call last):
  File "/Users/ibraheem/Desktop/bittensor sdk/bittensor/bittensor/core/test.py", line 23, in <module>
    logging.debug("Raw weights", raw_weights)
  File "/Users/ibraheem/Desktop/bittensor sdk/bittensor/bittensor/utils/btlogging/loggingmachine.py", line 454, in debug
    msg = _concat_message(msg, prefix, suffix)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/ibraheem/Desktop/bittensor sdk/bittensor/bittensor/utils/btlogging/loggingmachine.py", line 54, in _concat_message
    msg = f"{f'{prefix} - ' if prefix not in empty_pref_suf else ''}{msg}{f' - {suffix}' if suffix not in empty_pref_suf else ''}"
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()

This PR fixes that that and achieves the same outcome

To reproduce the issue:

import numpy as np
from bittensor.utils.btlogging import logging

raw_weights = np.array([0, 0, 0, 0])

logging.warning("Raw weights", raw_weights)