[gnome-shell] loginDialog: Make notListedButton accessible

[Marge Bot <marge-bot src gnome org>]

commit 7222bffdf808860d2b19f0b4e98929a5d28422d1
Author: Mike Gerow <gerow google com>
Date:   Wed Jan 13 12:29:35 2021 -0800

    loginDialog: Make notListedButton accessible
    
    Without this a screen reader just calls the notListedButton a
    "push button" instead of also including the "Not listed?" text.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1567>

 js/gdm/loginDialog.js | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/js/gdm/loginDialog.js b/js/gdm/loginDialog.js
index 9acb01c687..baddc22cd0 100644
--- a/js/gdm/loginDialog.js
+++ b/js/gdm/loginDialog.js
@@ -464,6 +464,7 @@ var LoginDialog = GObject.registerClass({
             child: notListedLabel,
             reactive: true,
             x_align: Clutter.ActorAlign.START,
+            label_actor: notListedLabel,
         });
 
         this._notListedButton.connect('clicked', 
this._hideUserListAskForUsernameAndBeginVerification.bind(this));