[mutter] tests/runner: Check compositor type instead of X11 policy

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

commit 270f1cf7a5477479df330dfb114c260c7e84bc78
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Feb 25 16:52:09 2021 +0100

    tests/runner: Check compositor type instead of X11 policy
    
    It's practically equivalent, and means we can soon ditch the global.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1833>

 src/tests/test-runner.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/tests/test-runner.c b/src/tests/test-runner.c
index dcfdf3d154..eb15a0752c 100644
--- a/src/tests/test-runner.c
+++ b/src/tests/test-runner.c
@@ -77,7 +77,7 @@ test_case_new (void)
   TestCase *test = g_new0 (TestCase, 1);
   MetaDisplay *display = meta_get_display ();
 
-  if (meta_get_x11_display_policy () == META_X11_DISPLAY_POLICY_MANDATORY)
+  if (!meta_is_wayland_compositor ())
     {
       test_wait_for_x11_display ();
       on_x11_display_opened (display, test);