ln/fix: remove legacy payment related error codes

These error codes were removed from the specification seven years ago
to prevent probing, so we don't need to handle these cases anymore.

Author: carlaKC

lightning/src/ln/onion_utils.rs

@@ -1287,7 +1287,7 @@ where
 
 		// indicate that payment parameter has failed and no need to update Route object
 		let payment_failed = match error_code & 0xff {
-			15 | 16 | 17 | 18 | 19 | 23 => true,
+			15 | 18 | 19 | 23 => true,
 			_ => false,
 		} && is_from_final_non_blinded_node; // PERM bit observed below even if this error is from the intermediate nodes