[gnome-shell] dbusServices/screencast: Use GTK4

[Marge Bot <marge-bot src gnome org>]

commit 2e9a2e68b7aa14a4147d0a18f1544e35d8c27b06
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Jan 20 02:48:24 2021 +0100

    dbusServices/screencast: Use GTK4
    
    The separate screencast service has some minimal GTK usage, which
    we can trivially move to GTK4.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1591>

 js/dbusServices/screencast/screencastService.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/js/dbusServices/screencast/screencastService.js b/js/dbusServices/screencast/screencastService.js
index 9ede9b541c..94e6f8f9cc 100644
--- a/js/dbusServices/screencast/screencastService.js
+++ b/js/dbusServices/screencast/screencastService.js
@@ -1,7 +1,7 @@
 // -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
 /* exported ScreencastService */
 
-imports.gi.versions.Gtk = '3.0';
+imports.gi.versions.Gtk = '4.0';
 
 const { Gio, GLib, Gst, Gtk } = imports.gi;
 
@@ -246,7 +246,7 @@ var ScreencastService = class extends ServiceImplementation {
         super(ScreencastIface, '/org/gnome/Shell/Screencast');
 
         Gst.init(null);
-        Gtk.init(null);
+        Gtk.init();
 
         this._recorders = new Map();
         this._senders = new Map();