pk: Fix dependencies view appearing

list.countChanged doesn't get emitted sometimes.


(cherry picked from commit ddc1b584)

libdiscover/backends/PackageKitBackend/qml/DependenciesButton.qml

@@ -13,7 +13,7 @@ Kirigami.LinkButton
     text: i18n("Show Dependencies...")
 
     onClicked: overlay.open()
-    visible: view.count > 0
+    visible: view.model.count > 0
 
     Connections {
         target: resource