Packaged HTML5 games are showing up in only a quarter of the screen display

HTML5 projects, once packaged are not showing up properly in the browser window. They're about a quarter of the size they should be. This does not happen in launch on, only package.

This does not happen in 4.12.5 - 3039270

1. Create a new project in 4.13.1
2. Package for HTML5
3. Use the local host helper and launch locally.

Result: The HTML5 project screen is taking up only a quarter of the screeen
Expected result: The project should load taking up most of the window space for the browser

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