filesystem: Fix is-hidden warning browsing filesystem entries
(grilo-test-ui-0.3:385073): GLib-GIO-CRITICAL **: 15:45:50.370: GFileInfo created without standard::is-hidden
(grilo-test-ui-0.3:385073): GLib-GIO-CRITICAL **: 15:45:50.370: file ../../../../Projects/jhbuild/glib/gio/gfileinfo.c: line 1587 (g_file_info_get_is_hidden): should not be reached
Edited by Bastien Nocera