misc: issue fixes for LinkedDevices view

1. Use correct model for calling revokeDevice
2. Fix RevokeDevicePasswordDialog background color

Change-Id: I0056bcde8012d76a9010c6ba95f93a8cb8bffc2e

src/settingsview/components/LinkedDevices.qml

@@ -61,7 +61,7 @@ ColumnLayout {
     RevokeDevicePasswordDialog{
         id: revokeDevicePasswordDialog
 
-        onRevokeDeviceWithPassword: deviceItemListModel.revokeDevice(idOfDevice, password)
+        onRevokeDeviceWithPassword: deviceItemListModel.sourceModel.revokeDevice(idOfDevice, password)
     }
 
     SimpleMessageDialog {
@@ -75,7 +75,7 @@ ColumnLayout {
         buttonTitles: [JamiStrings.optionOk, JamiStrings.optionCancel]
         buttonStyles: [SimpleMessageDialog.ButtonStyle.TintedBlue,
                        SimpleMessageDialog.ButtonStyle.TintedBlack]
-        buttonCallBacks: [function() {deviceItemListModel.revokeDevice(idOfDev, "")}]
+        buttonCallBacks: [function() {deviceItemListModel.sourceModel.revokeDevice(idOfDev, "")}]
     }
 
     Label {

src/settingsview/components/RevokeDevicePasswordDialog.qml

@@ -43,6 +43,7 @@ BaseDialog {
     contentItem: Rectangle {
         id: revokeDeviceContentRect
 
+        color: JamiTheme.secondaryBackgroundColor
         implicitWidth: JamiTheme.preferredDialogWidth
         implicitHeight: JamiTheme.preferredDialogHeight