Suppress NotFound for batch deletion.

I will copy my comment from the code, as it explains why we want this:

In the rare case where we found messages matching the spam filter across
multiple channels, it is possible that a single channel will only
contain a single message to delete. If that should be the case,
discord.py will use the "delete single message" endpoint instead of the
bulk delete endpoint, and the single message deletion endpoint will
complain if you give it that does not exist.  As this means that we have
no other message to delete in this channel (and message deletes work
per-channel), we can just log an exception and carry on with business.

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