Wizard: finish page: restore height hidden if not set

wizard/WizardFinish.qml

@@ -47,7 +47,7 @@ Item {
             + qsTr("<b>Allow background mining: </b>") + wizard.settings['allow_background_mining'] + "<br>"
             + qsTr("<b>Daemon address: </b>") + wizard.settings['daemon_address'] + "<br>"
             + qsTr("<b>testnet: </b>") + wizard.settings['testnet'] + "<br>"
-            + qsTr("<b>Restore height: </b>") + wizard.settings['restoreHeight'] + "<br>"
+            + (wizard.settings['restore_height'] === undefined ? "" : qsTr("<b>Restore height: </b>") + wizard.settings['restore_height']) + "<br>"
             + translationManager.emptyString
         return str;
     }

wizard/WizardMain.qml

@@ -137,7 +137,7 @@ Rectangle {
         appWindow.persistentSettings.auto_donations_amount = settings.auto_donations_amount
         appWindow.persistentSettings.daemon_address = settings.daemon_address
         appWindow.persistentSettings.testnet = settings.testnet
-        appWindow.persistentSettings.restoreHeight = parseInt(settings.restoreHeight)
+        appWindow.persistentSettings.restore_height = parseInt(settings.restore_height)
 
     }