privacy-indicator: make allowAttach property bool type instead of auto

Author: 4hnme

privacy-indicator/Panel.qml

@@ -16,7 +16,7 @@ Item {
   property real contentPreferredHeight: 450 * Style.uiScaleRatio
 
   readonly property var mainInstance: pluginApi?.mainInstance
-  readonly property var allowAttach: true
+  readonly property bool allowAttach: true
 
   Rectangle {
     id: panelContainer