Correct default expiry.

We previously stated in the codebase that the default invoice expiry
stated in the spec is 2 hours. It's actually 1 hour.

Author: valentinewallace

fuzz/src/chanmon_consistency.rs

@@ -272,7 +272,7 @@ fn get_payment_secret_hash(dest: &ChanMan, payment_id: &mut u8) -> Option<(Payme
 	let mut payment_hash;
 	for _ in 0..256 {
 		payment_hash = PaymentHash(Sha256::hash(&[*payment_id; 1]).into_inner());
-		if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 7200, 0) {
+		if let Ok(payment_secret) = dest.create_inbound_payment_for_hash(payment_hash, None, 3600, 0) {
 			return Some((payment_secret, payment_hash));
 		}
 		*payment_id = payment_id.wrapping_add(1);

lightning-invoice/src/utils.rs

@@ -54,7 +54,7 @@ where
 
 	let (payment_hash, payment_secret) = channelmanager.create_inbound_payment(
 		amt_msat,
-		7200, // default invoice expiry is 2 hours
+		3600, // default invoice expiry is 1 hours
 		0,
 	);
 	let our_node_pubkey = channelmanager.get_our_node_id();

lightning/src/ln/channelmanager.rs

@@ -3477,7 +3477,7 @@ impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelMana
 	/// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
 	/// in excess of the current time. This should roughly match the expiry time set in the invoice.
 	/// After this many seconds, we will remove the inbound payment, resulting in any attempts to
-	/// pay the invoice failing. The BOLT spec suggests 7,200 secs as a default validity time for
+	/// pay the invoice failing. The BOLT spec suggests 3,600 secs as a default validity time for
 	/// invoices when no timeout is set.
 	///
 	/// Note that we use block header time to time-out pending inbound payments (with some margin