irc: keep the keyboard live during RX floods (poll input every pass)

'/join #sl0p right after connect' looked broken: the main loop only
polled input when net_recv_nb returned nothing, and 'continue'd on every
received segment. During a big MOTD (irc.sl0p.foo's is ~60 lines of
color art) that starved input for the whole ~20s flood - the OSK
wouldn't even open, and keystrokes were dropped. gbtype input fared a
bit better (buffered in the 64-byte console ring) but still wasn't
serviced until the flood ended.

Poll pollin()/pollcon() once every loop iteration regardless of RX, and
only idle-sleep when a pass both received nothing and read no key. The
protocol/join logic was already correct (verified: JOIN #sl0p is sent,
accepted, and the client switches to [#sl0p] with topic + names) - this
just makes typing responsive while messages are streaming.

Verified against the live server: injecting /join #sl0p *during* the
MOTD flood now joins immediately instead of waiting it out.

(Note: '#' is on the OSK - third row, second from the end:
10,8,":;,=+*_!?()[]<>@#~" - just not obvious.)

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