QFontEngineFT doesn't handle High-DPI

QFontEngineFT::setQtDefaultHintStyle should probably call setDefaultHintStyle(HintNone) when QHighDpiScaling::isActive() and hintingPreference = QFont::PreferDefaultHinting. Currently freetype on Windows uses full hinting with High-DPI. It could also bypass QHighDpiScaling::isActive() check on Linux when building without fontconfig, but it's not visible as ftInitialDefaultHintStyle = HintNone on non-Windows.