Fix focus issues after dismissal of consecutive dialogs (like Add PC -> Add PC error)

app/gui/NavigableDialog.qml

@@ -2,27 +2,16 @@ import QtQuick 2.0
 import QtQuick.Controls 2.2
 
 Dialog {
-    property Item originalFocusItem
-
     parent: overlay
 
     x: Math.round((parent.width - width) / 2)
     y: Math.round((parent.height - height) / 2)
 
-    onAboutToShow: {
-        originalFocusItem = window.activeFocusItem
-    }
-
-    onOpened: {
-        // Force focus on the dialog to ensure keyboard navigation works
-        forceActiveFocus()
-    }
-
-    onClosed: {
+    onAboutToHide: {
         // We must force focus back to the last item for platforms without
         // support for more than one active window like Steam Link. If
         // we don't, gamepad and keyboard navigation will break after a
         // dialog appears.
-        originalFocusItem.forceActiveFocus()
+        stackView.forceActiveFocus()
     }
 }