efl_ui_image: fix hit_rect geometry only if scale type is expand

efl_ui_image: fix hit_rect geometry only if scale type is expand

In the past version, "clicked" event happens although image file is not
set and resizable is false and scale type is expand.

To keep the backward compatibility of supporting "clicked" event,
hit_rect geometry is set to be the same with object geometry if image
file is not set and scale type is expand.

The above logic is not applied to upstream.
Because size calculation logic between upstream and tizen is different
so _image_sizing_eval() is not called in upstream if image file is not
set.

@tizen_fix

Change-Id: I39e094702d631e2c3150ae7a9b4d8e314468fa5d