Bug 937079 - test_gallery_view.py is not switching to landscape view

The differences are not seen because the wait added is not on a UI level, 
I tried also waiting for 
<code>screen_width == image.photo_toolbar_width</code>
or 
<code>initial_image_scale != current_image_scale</code>
both with the same results.
But if you add a wait, (<code>time.wait(2)</code>)you can see that the orientation switch is done.