[gnome-shell] environment: Fix transition callback

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

commit 8b368d010f772fba123f198a5077d6778b76cae2
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Aug 7 02:26:32 2019 +0200

    environment: Fix transition callback
    
    This is rather embarrassing - we currently confuse the transition with
    the finished parameter, which means we always run the onComplete handler
    no matter whether the transition was interrupted or actually completed.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/668

 js/ui/environment.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/environment.js b/js/ui/environment.js
index b00b74dd9..a248ea069 100644
--- a/js/ui/environment.js
+++ b/js/ui/environment.js
@@ -64,7 +64,7 @@ function _trackTransition(transition, callback) {
     if (_easingTransitions.has(transition))
         transition.disconnect(_easingTransitions.get(transition));
 
-    let id = transition.connect('stopped', isFinished => {
+    let id = transition.connect('stopped', (t, isFinished) => {
         _easingTransitions.delete(transition);
         callback(isFinished);
     });