[applet] Open new KCM from the configure action

Whlie we're at it, also port the action to only appear when it's
available, as for example it would not be when using Kioso Mode.

src/applet/package/contents/ui/BluetoothApplet.qml

@@ -29,13 +29,13 @@ Item {
     Plasmoid.compactRepresentation: CompactRepresentation { }
     Plasmoid.fullRepresentation: FullRepresentation { }
 
-    function action_bluedevilkcm() {
-        KCMShell.open(["bluedevildevices", "bluedeviladapters", "bluedevilglobal"]);
+    function action_configure() {
+        KCMShell.openSystemSettings("bluetooth");
     }
 
     Component.onCompleted: {
         plasmoid.removeAction("configure");
-        plasmoid.setAction("bluedevilkcm", i18n("Configure &Bluetooth..."), "preferences-system-bluetooth");
+        plasmoid.setAction("configure", i18n("Configure &Bluetooth..."), "preferences-system-bluetooth");
 
         Logic.init();
     }

src/applet/package/contents/ui/Toolbar.qml

@@ -53,15 +53,14 @@ PlasmaExtras.PlasmoidHeading {
         PlasmaComponents3.ToolButton {
             id: openSettingsButton
 
+            visible: plasmoid.action("configure").enabled
             icon.name: "configure"
-
-            onClicked: {
-                KCMShell.open(["bluedevildevices", "bluedeviladapters", "bluedevilglobal"]);
-            }
+            onClicked: plasmoid.action("configure").trigger()
 
             PlasmaComponents3.ToolTip {
-                text: i18n("Configure Bluetooth...")
+                text: plasmoid.action("configure").text
             }
+            Accessible.name: plasmoid.action("configure").text
         }
     }