fix: action can't work

as title.

Author: 18202781743

panels/notification/bubble/package/NormalBubble.qml

@@ -34,6 +34,7 @@ NotifyItemContent {
     MouseArea {
         anchors.fill: parent
         hoverEnabled: true
+        z: -1 // default action
         onClicked: {
             if (!bubble.defaultAction)
                 return

panels/notification/center/notifyitem.cpp

@@ -120,6 +120,7 @@ void AppNotifyItem::updateActions()
     const auto index = actions.indexOf(QLatin1String("default"));
     if (index >= 0) {
         // default Action maybe have text.
+        m_defaultAction = QLatin1String("default");
         if (actions.size() % 2 == 1) {
             actions.remove(index);
         } else {