htlc: move htlc structure into channeld.

Other places require the flags and states, but the structure is
only needed in channeld, and even then we can remove several fields.

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

lightningd/commit_tx.h

@@ -3,6 +3,7 @@
 #include "config.h"
 #include <bitcoin/pubkey.h>
 #include <daemon/htlc.h>
+#include <lightningd/channel/channeld_htlc.h>
 
 struct keyset;
 struct sha256_double;