evas/events: fix multi-touch object targeting on touch down events

a touch press is both a touch and a move event, which means the canvas must
update its list of target objects on the first touch press to avoid using the
wrong objects when processing events

@fix

Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D11163