applets/clipboard: re-add removed delegate width override

This was removed in 88e9433e but probaly
should not have been, as doing so causes a binring loop on the width
property, even though there is no visual effect from the change.

applets/clipboard/contents/ui/Menu.qml

@@ -51,6 +51,9 @@ PlasmaComponents3.ScrollView {
         reuseItems: true
 
         delegate: ClipboardItemDelegate {
+            // FIXME: removing this causes a binding loop
+            width: menuListView.width - menuListView.leftMargin - menuListView.rightMargin
+
             supportsBarcodes: menu.supportsBarcodes
 
             onItemSelected: menu.itemSelected(uuid)