[mutter] compositor: Fix crash on startup

[Jasper St. Pierre <jstpierre src gnome org>]

commit 099fd2b3fb789784c90ea7442185239515aa7282
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sun Feb 2 09:57:48 2014 -0500

    compositor: Fix crash on startup
    
    A bad rebase in 757674a9d69881b1bd483a8c5b77a345ebb46fc6 accidentally
    removed the call to meta_plugin_manager_new().

 src/compositor/compositor.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/compositor/compositor.c b/src/compositor/compositor.c
index fbfa7b9..1e5d58d 100644
--- a/src/compositor/compositor.c
+++ b/src/compositor/compositor.c
@@ -657,6 +657,8 @@ meta_compositor_manage_screen (MetaCompositor *compositor,
   XMapWindow (xdisplay, info->output);
 
   redirect_windows (compositor, screen);
+
+  info->plugin_mgr = meta_plugin_manager_new (screen);
 }
 
 void