Only prevent logging of messages from history request

Preventing logging of all backlog messages meant that messages you sent
from other clients wouldn't be logged, even if wee-slack was running.
Additionally, there's an existing bug which sometimes causes the
messages you send in wee-slack to be marked as backlog messages, so
those wouldn't be logged either.

Instead, only prevent logging of messages from the history request,
since we always want to log new messages arriving over the websocket.
It's still only backlog messages which are not logged, so messages which
arrive when wee-slack isn't running will be logged (as long as you don't
read them in another client before starting wee-slack).

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