[gnome-shell] keyboard: Remove unnecessary boolean cast

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

commit b87455c089a34e427e4b43dcad89d87fe527b3e7
Author: Florian Müllner <fmuellner gnome org>
Date:   Sun Jun 30 00:33:20 2019 +0200

    keyboard: Remove unnecessary boolean cast
    
    In contexts where a statement (like if or while) expects a condition,
    any expression will be implicitly cast to boolean already without
    C-isms like double negation.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/606

 js/ui/status/keyboard.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/status/keyboard.js b/js/ui/status/keyboard.js
index ff2456a60..17abe8a92 100644
--- a/js/ui/status/keyboard.js
+++ b/js/ui/status/keyboard.js
@@ -227,7 +227,7 @@ var InputSourceSystemSettings = class extends InputSourceSettings {
 
         for (let i = 0; i < layouts.length && !!layouts[i]; i++) {
             let id = layouts[i];
-            if (!!variants[i])
+            if (variants[i])
                 id += '+' + variants[i];
             sourcesList.push({ type: INPUT_SOURCE_TYPE_XKB, id: id });
         }