[html-formfu] head-desk: don't reply to broken rawmode address

[Carl Franks]

Sigh,

Just realised that when I've been replying to messages, I hadn't been
changing the address if it was originally sent to the now-defunct
rawmode address.

I must write out 100 times: send messages to html-formfu at lists.scsys.co.uk

Expect a flurry of messages as I go through my 'sent' folder looking
for dead-end messages.

Carl