Fix trying node announcement broadcast for unannouced nodes

Previously, we would skip broadcasting node announcements if we had any
public channel. Here, we fix this bug and instead skip broadcasts if we
*don't* have any public channels.

src/lib.rs

@@ -654,7 +654,7 @@ impl<K: KVStore + Sync + Send + 'static> Node<K> {
 								continue;
 							}
 
-							if bcast_cm.list_channels().iter().any(|chan| chan.is_public) {
+							if !bcast_cm.list_channels().iter().any(|chan| chan.is_public) {
 								// Skip if we don't have any public channels.
 								continue;
 							}