splice: Update splice_info tlv to use odd version

Update the tlv to use the type referenced in the spec, which also makes marks the tlv as optional.

Changelog-EXPERIMENTAL: --experimental-splicing: if you have splicing enabled on a channel both nodes must upgrade in unison due to updating commitment_signeds splice_info tlv's type.

Author: ddustin

wire/extracted_peer_12_splice_update.patch

@@ -22,11 +22,12 @@ index 9abcb0e64..e2aae8efb 100644
  msgtype,commitment_signed,132
  msgdata,commitment_signed,channel_id,channel_id,
  msgdata,commitment_signed,signature,signature,
-@@ -309,6 +309,5 @@ msgdata,commitment_signed,num_htlcs,u16,
+@@ -309,7 +309,6 @@ msgdata,commitment_signed,num_htlcs,u16,
  msgdata,commitment_signed,htlc_signature,signature,num_htlcs
  msgdata,commitment_signed,splice_channel_id,commitment_signed_tlvs,
- tlvtype,commitment_signed_tlvs,splice_info,0
+-tlvtype,commitment_signed_tlvs,splice_info,0
 -tlvdata,commitment_signed_tlvs,splice_info,batch_size,u16,
++tlvtype,commitment_signed_tlvs,splice_info,1
  tlvdata,commitment_signed_tlvs,splice_info,funding_txid,sha256,
  msgtype,revoke_and_ack,133
  msgdata,revoke_and_ack,channel_id,channel_id,

wire/peer_wire.csv

@@ -308,7 +308,7 @@ msgdata,commitment_signed,signature,signature,
 msgdata,commitment_signed,num_htlcs,u16,
 msgdata,commitment_signed,htlc_signature,signature,num_htlcs
 msgdata,commitment_signed,splice_channel_id,commitment_signed_tlvs,
-tlvtype,commitment_signed_tlvs,splice_info,0
+tlvtype,commitment_signed_tlvs,splice_info,1
 tlvdata,commitment_signed_tlvs,splice_info,funding_txid,sha256,
 msgtype,revoke_and_ack,133
 msgdata,revoke_and_ack,channel_id,channel_id,