Fix behavior on pressing "X" in advanced options dialog

In the "advanced settings" dialog, if "X" instead of
"apply settings" is clicked, it is seen as "cancel" and
no settings are applied.

If there do are saved settings, make sure to ask the
user on pressing "write" if they do want the saved settings
applied, instead of applying no settings.

src/OptionsPopup.qml

@@ -59,6 +59,7 @@ Popup {
             anchors.fill: parent
             cursorShape: Qt.PointingHandCursor
             onClicked: {
+                initialized = false
                 popup.close()
             }
         }