kcms/users: get rid of useless factorisation

We don't call this function anywhere else besides the signal handler,
so we just move its code to the signal handler.

kcms/users/package/contents/ui/main.qml

@@ -75,14 +75,12 @@ KCM.ScrollViewKCM {
 
             highlighted: index == userList.currentIndex
 
-            function openPage() {
+            onClicked: {
                 userList.currentIndex = index
                 kcm.pop(0)
                 kcm.push("UserDetailsPage.qml", {user: userObject})
             }
 
-            onClicked: openPage()
-
             Kirigami.Theme.colorSet: highlighted ? Kirigami.Theme.Selection : Kirigami.Theme.View
 
             leading: Rectangle {