[Fix] Fix obscured url in format user@@example.com

MFH: rspamd-1.6

src/libserver/url.c

@@ -888,12 +888,19 @@ rspamd_web_parse (struct http_parser_url *u, const gchar *str, gsize len,
 				break;
 			case parse_at:
 				c = p;
-				st = parse_domain;
-				if (t == '[') {
+
+				if (t == '@') {
+					*flags |= RSPAMD_URL_FLAG_OBSCURED;
+					p ++;
+				}
+				else if (t == '[') {
 					st = parse_ipv6;
 					p++;
 					c = p;
 				}
+				else {
+					st = parse_domain;
+				}
 				break;
 			case parse_domain:
 				if (t == '/' || t == ':' || t == '?' || t == '#') {