[gnome-sound-recorder] preferences: Fix linting

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit e1a59aa8cfc9f80a083128b8441a0a456dd2e177
Author: Gaurav Agrawal <agrawalgaurav1999 gmail com>
Date:   Wed Mar 4 03:25:03 2020 +0530

    preferences: Fix linting

 src/preferences.js | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/src/preferences.js b/src/preferences.js
index 8e7a67b..ca58b7e 100644
--- a/src/preferences.js
+++ b/src/preferences.js
@@ -19,14 +19,10 @@
 */
 
 const Gio = imports.gi.Gio;
-const GLib = imports.gi.GLib;
 const Gtk = imports.gi.Gtk;
 
-const _ = imports.gettext.gettext;
-const C_ = imports.gettext.pgettext;
 
 const MainWindow = imports.mainWindow;
-const Main = imports.main;
 
 let formatComboBoxText = null;
 let channelsComboBoxText = null;