mnb-im-status-row: Workaround crasher by destroying actors in dispose
mnb-im-status-row: Workaround crasher by destroying actors in dispose

In finalize the ref count is zero. And thus calling clutter_actor_destroy may
lead to a chain of events that causes the parent-set signal to be fired. This
takes a reference but this will fail if the object has a zero reference count.

meego-netbook-ux/meego-panel-status,meego-netbook-ux/meego-panel-status