Fix focusing after closing a dialog

app/gui/NavigableDialog.qml

@@ -1,17 +1,15 @@
 import QtQuick 2.0
-import QtQuick.Controls 2.2
+import QtQuick.Controls 2.3
 
 Dialog {
-    // We should use Overlay.overlay here but that's not available in Qt 5.9 :(
-    parent: ApplicationWindow.contentItem
+    modal: true
 
     x: Math.round((parent.width - width) / 2)
     y: Math.round((parent.height - height) / 2)
 
-    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
+    onClosed: {
+        // We must force focus back to the last item. If we don't,
+        // gamepad and keyboard navigation will break after a
         // dialog appears.
         stackView.forceActiveFocus()
     }

app/gui/PcView.qml

@@ -289,10 +289,6 @@ CenteredGridView {
 
     NavigableMessageDialog {
         id: pairDialog
-
-        // Pairing dialog must be modal to prevent double-clicks from triggering
-        // pairing twice
-        modal: true
         closePolicy: Popup.CloseOnEscape
 
         // don't allow edits to the rest of the window while open