tests: remove needless include

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>

tests/unit/check-qobject.c

@@ -8,7 +8,6 @@
  */
 
 #include "qemu/osdep.h"
-#include "block/qdict.h"
 #include "qapi/error.h"
 #include "qapi/qmp/qbool.h"
 #include "qapi/qmp/qdict.h"