common: downgrade LND 'internal error' properly.

Thanks to @zerofeerouting for another report.

"desc" here is the sanitized message, eg:
"ERROR error channel 0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef: internal error"

Signed-off-by: Rusty Russell <[email protected]>

common/peer_failed.c

@@ -88,7 +88,7 @@ void peer_failed_received_errmsg(struct per_peer_state *pps,
 	 * prior to 0.11 we would turn this into a warning, and they
 	 * would recover after a reconnect.  So we downgrade, but snark
 	 * about it in the logs. */
-	if (!warning && streq(desc, "internal error")) {
+	if (!warning && strends(desc, "internal error")) {
 		status_unusual("lnd sent 'internal error':"
 			       " let's give it some space");
 		warning = true;