[gnome-control-center] sharing: Add missing widget cast

[Robert Ancell <rancell src gnome org>]

commit dcedf93e7267147966a54b76476fd66f9f82db83
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Feb 25 09:46:13 2020 +1300

    sharing: Add missing widget cast
    
    Was missed in a5de11c3d6.

 panels/sharing/cc-sharing-panel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/panels/sharing/cc-sharing-panel.c b/panels/sharing/cc-sharing-panel.c
index 152a290a1..058f2b513 100644
--- a/panels/sharing/cc-sharing-panel.c
+++ b/panels/sharing/cc-sharing-panel.c
@@ -1110,7 +1110,7 @@ cc_sharing_panel_setup_screen_sharing_dialog_gnome_remote_desktop (CcSharingPane
                     G_CALLBACK (screen_sharing_hide_cb),
                     self);
 
-  cc_grd_update_password_entry (self->remote_control_password_entry);
+  cc_grd_update_password_entry (GTK_ENTRY (self->remote_control_password_entry));
 
   /* accept at most 8 bytes in password entry */
   g_signal_connect (self->remote_control_password_entry,