Fixed: updated unit tests

Update expected y-offset, remove superseded h/w parameters
Fixed: toggling fullscreen adding margin

Previously, exiting fullscreen mode was adding a hardcoded margin of 30px.

Now, exiting fullscreen mode simply removes the inline margin style of 0px (which was added upon entering fullscreen), unless we are using enableAutoWidth, in which case we add a margin of viewerWidthPadding.