do not emit events from efl_io_closer_close() on destructor.

do not emit events from efl_io_closer_close() on destructor.

On destructor we're not supposed to emit events, I even thought that
would be implicit, but it's not. If we do, for example an event
handler that would 'efl_del()' on "EFL_IO_CLOSER_EVENT_CLOSED" would
trigger too-many unrefs.