fix(dcc-dock-plugin): combobox is empty

Model property assignment error

pms: TASK-286969

Author: mhduiy

panels/dock/dcc-dock-plugin/qml/main.qml

@@ -213,7 +213,7 @@ DccObject {
             pageType: DccObject.Editor
             page: CustomComBobox {
                 flat: true
-                model: showModeMode
+                model: showModeModel
                 currentIndex: indexByValue(dccData.dockInter.showInPrimary)
 
                 ListModel {