[applet] Adapt to new containment API

applet/contents/ui/main.qml

@@ -677,7 +677,7 @@ Item {
                 }
 
                 PlasmaComponents3.ToolButton {
-                    visible: plasmoid.containmentType !== PlasmaCore.Types.CustomEmbeddedContainment
+                    visible: !(plasmoid.containmentDisplayHints & PlasmaCore.Types.ContainmentDrawsPlasmoidHeading)
 
                     icon.name: "configure"
                     onClicked: plasmoid.action("configure").trigger()