Update filtering.py to reduce nickname alert spam

This updates the `on_voice_state_update` listener of the filtering cog.

Currently, it calls `self._check_bad_name` where it should call `self._check_bad_display_name`. The difference is that the latter method rate-limits how often a filtering alert is sent for a specific user's display name. Using the former method results in spammy alerts when a user with a bad display name is in a voice channel.

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