[gnome-tour] Don't init gtk manually

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit 451ca975e056c8de4709536e1c5084c1475fd05f
Author: Bilal Elmoussaoui <belmouss redhat com>
Date:   Sat Jan 29 11:53:12 2022 +0100

    Don't init gtk manually
    
    It is already handled by the gtk subclass

 src/main.rs | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/src/main.rs b/src/main.rs
index d987f86..9950c77 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -21,8 +21,6 @@ fn main() {
     glib::set_application_name(&gettext("Tour"));
     glib::set_prgname(Some("Tour"));
 
-    gtk::init().expect("Unable to start GTK3");
-
     let res = gio::Resource::load(config::RESOURCES_FILE).expect("Could not load resources");
     gio::resources_register(&res);