Port Settings to new Kirigami Form components

src/qml/Settings/ColorScheme.qml

@@ -6,14 +6,18 @@ import QtQuick.Controls 2.15 as QQC2
 import QtQuick.Layouts 1.15
 
 import org.kde.kirigami 2.15 as Kirigami
+import org.kde.kirigamiaddons.labs.mobileform 0.1 as MobileForm
 
 import org.kde.neochat 1.0
 
-QQC2.ComboBox {
+MobileForm.FormComboBoxDelegate {
+    Layout.fillWidth: true
+    text: i18n("Themes")
     textRole: "display"
+    valueRole: "display"
     model: ColorSchemer.model
     Component.onCompleted: currentIndex = ColorSchemer.indexForScheme(Config.colorScheme);
-    onActivated: {
+    onCurrentValueChanged: {
         ColorSchemer.apply(currentIndex);
         Config.colorScheme = ColorSchemer.nameForIndex(currentIndex);
         Config.save();