Move Channel's blocked monitor updates vec to an even TLV

In 9dfe42c,
`ChannelMonitorUpdate`s were stored in `Channel` while they were
being processed. Because it was possible (though highly unlikely,
due to various locking likely blocking persistence) an update was
in-flight (even synchronously) when a `ChannelManager` was
persisted, the new updates were persisted via an odd TLV.

However, in 4041f08 these pending
monitor updates were moved to `ChannelManager`, with appropriate
handling there. Now the only `ChannelMonitorUpdate`s which are
stored in `Channel` are those which are explicitly blocked, which
requires the async pipeline.

Because we don't support async monitor update users downgrading to
0.0.115 or lower, we move to persisting them via an even TLV. As
the odd TLV storage has not yet been released, we can do so
trivially.

Fixes #2317.

Author: TheBlueMatt

lightning/src/ln/channel.rs

@@ -6781,6 +6781,7 @@ impl<Signer: WriteableEcdsaChannelSigner> Writeable for Channel<Signer> {
 			(5, self.context.config, required),
 			(6, serialized_holder_htlc_max_in_flight, option),
 			(7, self.context.shutdown_scriptpubkey, option),
+			(8, self.context.blocked_monitor_updates, vec_type),
 			(9, self.context.target_closing_feerate_sats_per_kw, option),
 			(11, self.context.monitor_pending_finalized_fulfills, vec_type),
 			(13, self.context.channel_creation_height, required),
@@ -6794,7 +6795,6 @@ impl<Signer: WriteableEcdsaChannelSigner> Writeable for Channel<Signer> {
 			(28, holder_max_accepted_htlcs, option),
 			(29, self.context.temporary_channel_id, option),
 			(31, channel_pending_event_emitted, option),
-			(33, self.context.blocked_monitor_updates, vec_type),
 			(35, pending_outbound_skimmed_fees, optional_vec),
 			(37, holding_cell_skimmed_fees, optional_vec),
 		});
@@ -7089,6 +7089,7 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
 			(5, config, option), // Note that if none is provided we will *not* overwrite the existing one.
 			(6, holder_max_htlc_value_in_flight_msat, option),
 			(7, shutdown_scriptpubkey, option),
+			(8, blocked_monitor_updates, vec_type),
 			(9, target_closing_feerate_sats_per_kw, option),
 			(11, monitor_pending_finalized_fulfills, vec_type),
 			(13, channel_creation_height, option),
@@ -7102,7 +7103,6 @@ impl<'a, 'b, 'c, ES: Deref, SP: Deref> ReadableArgs<(&'a ES, &'b SP, u32, &'c Ch
 			(28, holder_max_accepted_htlcs, option),
 			(29, temporary_channel_id, option),
 			(31, channel_pending_event_emitted, option),
-			(33, blocked_monitor_updates, vec_type),
 			(35, pending_outbound_skimmed_fees_opt, optional_vec),
 			(37, holding_cell_skimmed_fees_opt, optional_vec),
 		});