[gnome-shell] appDisplay: Add missing semicolon

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

commit 0ecf135a4bd89f4527952473c396c5c862fbe67a
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Jul 23 19:42:16 2019 +0200

    appDisplay: Add missing semicolon
    
    This slipped through in commit eaa320 ...
    
    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 03881ca3f..7e0be444f 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -135,7 +135,7 @@ class BaseAppView {
     addItem(icon) {
         let id = icon.id;
        if (this.hasItem(id))
-            throw new Error(`icon with id ${id} already added to view`)
+            throw new Error(`icon with id ${id} already added to view`);
 
         this._allItems.push(icon);
         this._items[id] = icon;