[applets/devicenotifier] Simplify adding the default contextual action

(cherry picked from commit a0965f39)

applets/devicenotifier/package/contents/ui/DeviceItem.qml

@@ -262,9 +262,7 @@ PlasmaExtras.ExpandableListItem {
     }
 
     // "Mount" action that does not open it in the file manager
-    QQC2.Action {
-        id: mountWithoutOpeningAction
-
+    contextualActionsModel: QQC2.Action {
         text: i18n("Mount")
         icon.name: "media-mount"
 
@@ -277,8 +275,4 @@ PlasmaExtras.ExpandableListItem {
             service.startOperationCall(operation);
         }
     }
-
-    Component.onCompleted: {
-        contextualActionsModel.push(mountWithoutOpeningAction);
-    }
 }