[gnome-shell] appDisplay: Indent with spaces rather than tabs

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit a455860978f5ac51c1df0fecbd270ec5dde9f575
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Jul 23 19:58:05 2019 +0200

    appDisplay: Indent with spaces rather than tabs
    
    Another style nit that sneaked in with commit eaa32090b9.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/640

 js/ui/appDisplay.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 7e0be444f..a33929e67 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -134,7 +134,7 @@ class BaseAppView {
 
     addItem(icon) {
         let id = icon.id;
-       if (this.hasItem(id))
+        if (this.hasItem(id))
             throw new Error(`icon with id ${id} already added to view`);
 
         this._allItems.push(icon);