Problem: MS-Windows: Dark mode titlebar is not configurable
(after v9.1.1813)
Solution: Revert patch v9.1.1813
Revert "patch 9.1.1813: MS-Windows: title bar is always white"
This reverts commit dddde9ce12.
related: #18282
Signed-off-by: Christian Brabandt <cb@256bit.org>