[gnome-boxes] unattended-installer: Use correct API for grabbing focus

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 5bbb1392f8bf91e16af7cb0156603d1642dda44f
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Thu Apr 11 02:56:39 2013 +0300

    unattended-installer: Use correct API for grabbing focus
    
    Gtk.Widget.is_focus is not for grabbing focus but dictates whether the
    widget is the focus widget within the toplevel or not.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=664218

 src/unattended-installer.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/unattended-installer.vala b/src/unattended-installer.vala
index 9b939ba..0b49cd8 100644
--- a/src/unattended-installer.vala
+++ b/src/unattended-installer.vala
@@ -423,7 +423,7 @@ private class Boxes.UnattendedInstaller: InstallerMedia {
         notebook.append_page (password_entry);
         button.clicked.connect (() => {
             notebook.next_page ();
-            password_entry.is_focus = true;
+            password_entry.grab_focus ();
         });
         password_entry.focus_out_event.connect (() => {
             if (password_entry.text_length == 0)