ecore_wayland: set touch_focus window when gets pointer_enter

ecore_wayland: set touch_focus window when gets pointer_enter

Summary:
When user touches the screen, ecore_wayland gets touch_motion event before touch_down event.
But touch_focus would be NULL in cb_touch_motion, so doesn't send ECORE_EVENT_MOUSE_MOVE event to client.
This fix set touch_focus when gets pointer_enter same as pointer_focus.

Test Plan:
when the application is launched for first time, user clicks on any area of the screen.
We can see the posion of touch event wrong.

@fix

Reviewers: devilhorns, raster, ManMower, zmike

Subscribers: input.hacker, cedric, jpeg, JHyun

Differential Revision: https://phab.enlightenment.org/D3545