qt: detect Windows 11 22H2 properly in win32windoweffects module

Windows 11 identifies as Windows 10 (NT 10), so this comparison always yields false.

QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0, 22621) would also correct this issue, but I opted in to directly use QOperatingSystemVersion::Windows11_22H2 now instead.

As a side note, native acrylic background for Win32 windows only gained support with the Windows 11 22H2 update, that's why there is the check here.

Note that according to the general conventions a transparent window must be frameless on Windows. This is currently not the case, because "frameless window don't support areo snapping". So, it can be considered as a known bug if native acrylic does not work as intended. This grants a requirement of change to use frameless window, and get rid of the current workaround that simulates frameless window in mainctx_win32.cpp. If aero snapping does not work, it is Windows's problem since we are using frameless windows in every other platform.