security fix for op=digestTest

backend.php

@@ -3946,6 +3946,7 @@
 
 	if ($op == "digestTest") {
 		header("Content-Type: text/plain");
+
 		echo prepare_headlines_digest($link, $_SESSION["uid"]);
 		$print_exec_time = false;
 

functions.php

@@ -2398,6 +2398,7 @@
 			WHERE 
 				ref_id = ttrss_entries.id AND feed_id = ttrss_feeds.id 
 				AND $interval_query
+				AND ttrss_user_entries.owner_uid = $user_id
 				AND unread = true ORDER BY ttrss_feeds.title, date_entered DESC
 			LIMIT $limit");