comctl32/button: Do not set BS_PUSHBUTTON and BS_DEFPUSHBUTTON style directly to Split Buttons and Command Links.

For Split Buttons and Command Links of common control version 6, setting
BS_PUSHBUTTON and BS_DEFPUSHBUTTON style toggles their default bit.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=47621Signed-off-by: Zhiyi Zhang <zzhang@codeweavers.com>
Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>