[gnome-settings-daemon] tests: Fix mutter logs always being empty

[Bastien Nocera <hadess src gnome org>]

commit bea6b7dff9e008d6de3a0a68aeb986bb53494fb8
Author: Bastien Nocera <hadess hadess net>
Date:   Fri Mar 2 17:19:20 2018 +0100

    tests: Fix mutter logs always being empty
    
    Copy/paste error in the logs meant we wrote to the wrong location.

 tests/gsdtestcase.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tests/gsdtestcase.py b/tests/gsdtestcase.py
index 29e81d7e..48659b72 100644
--- a/tests/gsdtestcase.py
+++ b/tests/gsdtestcase.py
@@ -173,7 +173,7 @@ class GSDTestCase(dbusmock.DBusTestCase):
         # See https://gitlab.gnome.org/GNOME/mutter/merge_requests/15
         os.environ['XDG_SESSION_TYPE'] = 'x11'
         klass.mutter = subprocess.Popen(['mutter', '--x11'],
-                                         stdout=klass.monitor_log,
+                                         stdout=klass.mutter_log,
                                          stderr=subprocess.STDOUT)
 
     def stop_mutter(klass):