Improve sql performance print_project_option_list

Cache subprojects before processing them to reduce the number of SQL
queries executed.

Previously, only first level projects got cached, resulting in repeated
queries (one for each project).

Fixes #20139

Signed-off-by: Damien Regad <dregad@mantisbt.org>

core/print_api.php

@@ -617,6 +617,7 @@ function print_subproject_option_list( $p_parent_id, $p_project_id = null, $p_fi
 	array_push( $p_parents, $p_parent_id );
 	$t_user_id = auth_get_current_user_id();
 	$t_project_ids = user_get_accessible_subprojects( $t_user_id, $p_parent_id );
+	project_cache_array_rows( $t_project_ids );
 	$t_can_report = true;
 
 	foreach( $t_project_ids as $t_id ) {