use simplified syntax

maintenance_logs.php

@@ -144,7 +144,7 @@ if (count($parameters) > 0) {
 //prepare to page the results
 $rows_per_page = $settings->get('domain', 'paging', 50);
 $param = $search ? "&search=".$search : null;
-$page = isset($_GET['page']) ? $_GET['page'] : 0;
+$page = $_GET['page'] ?? 0;
 list($paging_controls, $rows_per_page) = paging($num_rows, $param, $rows_per_page);
 list($paging_controls_mini, $rows_per_page) = paging($num_rows, $param, $rows_per_page, true);
 $offset = $rows_per_page * $page;