[mutter] monitor-tests: Fix error message grammar mistake

[Jonas Ådahl <jadahl src gnome org>]

commit e76ab05d45ab0cff7e9719b66d391d3c369b1b10
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Oct 4 09:43:09 2017 -0400

    monitor-tests: Fix error message grammar mistake

 src/tests/monitor-unit-tests.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/tests/monitor-unit-tests.c b/src/tests/monitor-unit-tests.c
index 8863737..529a6bd 100644
--- a/src/tests/monitor-unit-tests.c
+++ b/src/tests/monitor-unit-tests.c
@@ -4941,7 +4941,7 @@ meta_test_monitor_migrated_rotated (void)
   if (!meta_migrate_old_monitors_config (config_store,
                                          old_config_file,
                                          &error))
-    g_error ("Failed to migrated config: %s", error->message);
+    g_error ("Failed to migrate config: %s", error->message);
 
   emulate_hotplug (test_setup);