[gnome-shell] authPrompt: Remove stray tab character

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a00a186772e9b89d475a4a67e97de23b60c55e04
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Thu Jun 29 18:16:11 2017 -0500

    authPrompt: Remove stray tab character

 js/gdm/authPrompt.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/gdm/authPrompt.js b/js/gdm/authPrompt.js
index e0d8b8c..33bacff 100644
--- a/js/gdm/authPrompt.js
+++ b/js/gdm/authPrompt.js
@@ -263,7 +263,7 @@ const AuthPrompt = new Lang.Class({
     _onVerificationComplete: function() {
         this.setActorInDefaultButtonWell(null);
         this.verificationStatus = AuthPromptStatus.VERIFICATION_SUCCEEDED;
-       this.cancelButton.reactive = false;
+        this.cancelButton.reactive = false;
     },
 
     _onReset: function() {