[gnome-shell-sass] unlockDialog: Use unique unlock-dialog style class

[Florian Müllner <fmuellner src gnome org>]

commit 364b4c141e0d4c2c74897ab59ff2b3dfbfc2ab74
Author: Joonas Henriksson <joonas henriksson gmail com>
Date:   Wed Aug 26 03:06:46 2020 +0300

    unlockDialog: Use unique unlock-dialog style class
    
    Allows styling the unlock dialog elements individually from the GDM
    login dialog.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1421

 widgets/_login-dialog.scss | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/widgets/_login-dialog.scss b/widgets/_login-dialog.scss
index 06fdcf2..6c40072 100644
--- a/widgets/_login-dialog.scss
+++ b/widgets/_login-dialog.scss
@@ -5,7 +5,8 @@
   max-width: 23em;
 }
 
-.login-dialog {
+.login-dialog,
+.unlock-dialog {
   //reset
   border: none;
   background-color: transparent;