Ticket #3489: fix reloading of panelized file panel.
How to reproduce the bug:
1) Add something to 'Panelize'. It works with 'Find file' and 'External
panelize' too.
2) Press C-o several (at least two) times (or run some console command).
3) Panel is now empty
* (reload_panelized): always chdir to panel's cwd to refresh the VFS's cwd
before file list update.
* (update_panels): change order of panel update: first update other panel,
then current one. Remove internal variable. Fix description.
Signed-off-by: Andrew Borodin <aborodin@vmail.ru>