ecore_wl2: send mouse move event when client resized

ecore_wl2: send mouse move event when client resized

When the window size changes, the client needs to update the pointer
position information.
Ex)
before resizing, window geom: x:0, y:560, w:500, h:520
after resizing,  window geom: x:0, y:504, w:500, h:576
we need to add 56 (= 560 - 504) to the y position of pointer.

This patch fixes the bug in the following scenario.

1. window is resized
2. user clicks the mouse button without moving the mouse.
3. wrong button is clicked because wl_pointer.button does not contain
the position information.

@tizen_only

Change-Id: I078a490dea125722dbeec6eb66f0e306ac16b121