Even though themed dialog itself doesn't need to repaint after WM_SYSCOLORCHANGE is received,
WM_SYSCOLORCHANGE should be passed to the original dialog procedure DefDlgProcW(), which can then
forward WM_SYSCOLORCHANGE to its common controls and call COMCTL32_RefreshSysColors().

Fix wrong property sheet tab background color after winecfg disables theming.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=44511Signed-off-by: Zhiyi Zhang <zzhang@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>