BOLT 2: Error instead of warning on shutdown on unopened channel.

Abandoning channel is kinda what they want here.

Reported-by: Matt Corallo
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

02-peer-protocol.md

@@ -560,7 +560,7 @@ A sending node:
 
 A receiving node:
  - if it hasn't received a `funding_signed` (if it is a funder) or a `funding_created` (if it is a fundee):
- - SHOULD send a `warning`.
+ - SHOULD send an `error` and fail the channel.
  - if the `scriptpubkey` is not in one of the above forms:
  - SHOULD send a `warning`.
  - if it hasn't sent a `funding_locked` yet: