Currently we actually insist it's the default, but in future it could be
different.
We also need to tell openingd what the channel_type was, if we resume
via openingd_funder_complete().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Openingd can query them itself (as dualopend already does). And move
the two feature args next to each other on the wire.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>