[metacity] keybindings: fix shortcuts regression

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 1de8fdb4804b5e28965d454a642c9eab2bf5636c
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Jul 4 11:23:30 2017 +0300

    keybindings: fix shortcuts regression
    
    Commit b9cfaa8803fa019b3a1502b067802f2434b6e737 removed
    meta_display_screen_for_xwindow function. It was supposed to be
    replaced with display->screen...
    
    https://bugzilla.gnome.org/show_bug.cgi?id=784500

 src/core/keybindings.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)
---
diff --git a/src/core/keybindings.c b/src/core/keybindings.c
index 50e70e5..6a1d144 100644
--- a/src/core/keybindings.c
+++ b/src/core/keybindings.c
@@ -1262,11 +1262,7 @@ meta_display_process_key_event (MetaDisplay *display,
   if (all_bindings_disabled)
     return;
 
-  /* if key event was on root window, we have a shortcut */
-  screen = meta_display_screen_for_root (display, event->xkey.window);
-
-  if (screen == NULL)
-    return; /* event window is destroyed */
+  screen = display->screen;
 
   /* ignore key events on popup menus and such. */
   if (meta_ui_window_is_widget (screen->ui, event->xany.window))