Qt: Enable hi-dpi pixmaps

src/duckstation-qt/main.cpp

@@ -13,6 +13,7 @@ int main(int argc, char* argv[])
   qRegisterMetaType<std::optional<bool>>();
 
   QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+  QGuiApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
 #if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
   QGuiApplication::setHighDpiScaleFactorRoundingPolicy(Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
 #endif