xpay: remove the use of auto.sourcefree

Changelog-None

Signed-off-by: Lagrang3 <lagrang3@protonmail.com>

Author: Lagrang3

plugins/xpay/xpay.c

@@ -1465,8 +1465,6 @@ static struct command_result *getroutes_for(struct command *aux_cmd,
 	json_array_start(req->js, "layers");
 	/* Add local channels */
 	json_add_string(req->js, NULL, "auto.localchans");
-	/* We don't pay fees for ourselves */
-	json_add_string(req->js, NULL, "auto.sourcefree");
 	/* Add xpay global channel */
 	json_add_string(req->js, NULL, "xpay");
 	/* Add private layer */