Remove Qt::Drawer from the list of useful macOS attributes


The flag's documentation indicates that the widget is a drawer on macOS,
but this this feature is obsolete. Setting the flag has no effect.

Pick-to: 6.12
Change-Id: If8a0aba8d991549bebfbead52449cb80c9ca6d1f
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
commitda09d53258c83492eba497f54781422f0c124419
parente016742b022ad8a21a73e66316bbb86e7315c70e
authorAndrey Filipenkov <decapitator@ukr.net>
committerTor Arne Vestbø <tor.arne.vestbo@qt.io>
commit timeWed, 14 Oct 2026 16:08:13 +0000