fix: icon is blurry when zoom is not 1x

set highdpi to true

Log:

Author: Decodetalkers

dde-clipboard/main.cpp

@@ -21,6 +21,7 @@ int main(int argc, char *argv[])
     DGuiApplicationHelper::setAttribute(DGuiApplicationHelper::ColorCompositing, true);
 
     DApplication *app = DApplication::globalApplication(argc, argv);
+    DApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, true);
 
     app->setOrganizationName("deepin");
     app->setApplicationName("dde-clipboard");