elm_interface_scrollable : Fix logic about setting EVAS_EVENT_FLAG_ON_HOLD
elm_interface_scrollable : Fix logic about setting EVAS_EVENT_FLAG_ON_HOLD

Summary: Even if scroller is not scrolled, EVAS_EVENT_FLAG_ON_HOLD is set. So clicked event is canceled in Edje.

Test Plan:
On the button in the vertical scroller, click button and move mouse horizontal.
Mouse up on the button, so now button is not clicked

Reviewers: Hermet, CHAN, seoz, jaehwan, woohyun, SanghyeonLee

Differential Revision: https://phab.enlightenment.org/D2550

FlorentRevest/Elementary,rvandegrift/elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary,rvandegrift/elementary,rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary