circe-ctcp-TIME-handler: Remove newlines from ddate output.

This caused bugs on discordian holydays. Discovered on Mojoday,
though, not Mungday or Chaoflux.
circe-reconnect: Clear `circe-server-filter-data`.

This variable could still have data in it from prior connections
which has so far been unprocessed. I'm not quite sure under which
cirumstances this might happen, but this is the clean solution to
prevent it.