Make config.h inclusion consistent

Signed-off-by: Bryce Harrington <bryce@osg.samsung.com>
Reviewed-by: Derek Foreman <derekf@osg.samsung.com>
diff --git a/clients/weston-simple-im.c b/clients/weston-simple-im.c
index 0ee505a..c997467 100644
--- a/clients/weston-simple-im.c
+++ b/clients/weston-simple-im.c
@@ -21,7 +21,7 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
-#include <config.h>
+#include "config.h"
 
 #include <stdio.h>
 #include <stdlib.h>