applets/clipboard: Reuse items in ListView

The delegate can be reused, and no regression was found.

applets/clipboard/contents/ui/Menu.qml

@@ -48,6 +48,8 @@ PlasmaComponents3.ScrollView {
         rightMargin: PlasmaCore.Units.smallSpacing * 2
         spacing: PlasmaCore.Units.smallSpacing
 
+        reuseItems: true
+
         delegate: ClipboardItemDelegate {
             supportsBarcodes: menu.supportsBarcodes