Make scroll views scrollable with touch

gui/ui/app.slint

@@ -49,6 +49,8 @@ component GoodsList {
     in property <[SItem]> items;
 
     ListView {
+        mouse-drag-pan-enabled: true;
+
         for item in items: VerticalLayout {
             GoodListItem {
                 item: item;
@@ -71,6 +73,7 @@ component GoodButtons inherits ScrollView {
     property <int> count-y: ceil(favorites.length / count-x);
 
     viewport-height: (count-y * (button-height + button-spacing)) * 1pt;
+    mouse-drag-pan-enabled: true;
 
     for item[idx] in favorites: Button {
         x: floor(mod(idx, count-x)) * (root.button-width + root.button-spacing) * 1pt;