Fix PendingHTLCsForwardable generation on deser

Author: valentinewallace

lightning/src/ln/channelmanager.rs

@@ -7515,7 +7515,16 @@ where
 			}
 		}
 
-		if !forward_htlcs.is_empty() {
+		let mut forward_ev_exists = false;
+		let mut intercept_count = 0;
+		for ev in &pending_events_read {
+			match ev {
+				events::Event::PendingHTLCsForwardable { .. } => { forward_ev_exists = true; break }
+				events::Event::HTLCIntercepted { .. } => intercept_count += 1,
+				_ => {}
+			}
+		}
+		if !forward_ev_exists && intercept_count < forward_htlcs.len() {
 			// If we have pending HTLCs to forward, assume we either dropped a
 			// `PendingHTLCsForwardable` or the user received it but never processed it as they
 			// shut down before the timer hit. Either way, set the time_forwardable to a small