plugins/pay: use feature set from lightningd to decode bolt11.

This means we correctly reject invoices with features we don't understand.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

plugins/pay.c

@@ -1283,8 +1283,8 @@ static struct command_result *json_pay(struct command *cmd,
 		   NULL))
 		return command_param_failed();
 
-	/* FIXME: We need to know our features! */
+	b11 = bolt11_decode(cmd, b11str, plugin_feature_set(cmd->plugin),
-	b11 = bolt11_decode(cmd, b11str, NULL, NULL, &fail);
+			    NULL, &fail);
 	if (!b11) {
 		return command_fail(cmd, JSONRPC2_INVALID_PARAMS,
 				    "Invalid bolt11: %s", fail);