Fix | Prevent scrollbars on ViewTransitions MPA example

[bloycey]

The Problem

Scrollbars appearing on on the ViewTransitions MPA example.

I don't believe this was intended.

The Solution

Added display: block to the img element. The bug was occurring due to the way whitespace is rendered with inline elements. Changing to display: block sidesteps this issue. The images are still full screen, and there is no additional scroll and no scrollbars.