Refactor message_test
Refactor message_test

- Move `TestCantParse` functions to the top
- Move `TestCanParseEmoteMessage` under the other PRIVMSG tests

Update `TestCanParseActionMessage` to just test `Action` as the rest of
the values match `TestCanParsePRIVMSGMessage`.

Merge `TestCanParseTimeoutMessage` into `TestCanParseBanMessage` as
there was only a single difference between them.

gempir/go-twitch-irc,gempir/go-twitch-irc