Fix PHP 8 warning on manage_user_page

Declaring a required parameter after an optional one is deprecated in
PHP 8.

Fixed also usage of undefined constant ALL

Fixes #27464

core/print_api.php

@@ -1377,7 +1377,7 @@ function print_view_bug_sort_link( $p_string, $p_sort_field, $p_sort, $p_dir, $p
  * @param string  $p_class         The CSS class of the link.
  * @return void
  */
-function print_manage_user_sort_link( $p_page, $p_string, $p_field, $p_dir, $p_sort_by, $p_hide_inactive = 0, $p_filter = ALL, $p_search, $p_show_disabled = 0, $p_class = '' ) {
+function print_manage_user_sort_link( $p_page, $p_string, $p_field, $p_dir, $p_sort_by, $p_hide_inactive = 0, $p_filter = 'ALL', $p_search = '', $p_show_disabled = 0, $p_class = '' ) {
 	if( $p_sort_by == $p_field ) {
 		# If this is the selected field flip the order
 		if( 'ASC' == $p_dir || ASCENDING == $p_dir ) {