[gdm] utils: Don't use deprecated gdk_cursor_new

[Robert Ancell <rancell src gnome org>]

commit 4099ac81597ab5640406c23829fb3c960dd53ecf
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Dec 5 15:19:23 2017 +1300

    utils: Don't use deprecated gdk_cursor_new

 utils/gdm-screenshot.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/utils/gdm-screenshot.c b/utils/gdm-screenshot.c
index 7d1e2cf..01b3585 100644
--- a/utils/gdm-screenshot.c
+++ b/utils/gdm-screenshot.c
@@ -73,7 +73,7 @@ screenshot_grab_lock (void)
                 goto out;
         }
 
-        cursor = gdk_cursor_new (GDK_WATCH);
+        cursor = gdk_cursor_new_for_display (gdk_display_get_default (), GDK_WATCH);
         gdk_pointer_grab (gtk_widget_get_window (selection_window), FALSE, 0, NULL,
                           cursor, GDK_CURRENT_TIME);
         gdk_cursor_unref (cursor);