Photon: Iterate on sizes array for themes without content_width

Here's the layout before 4.0.4:


Here's after:


Photon decided to introduce a max-width of 1000...

Disabled Photon for now, but would love to get it back.

You can see my specific code here - http://rothschildportraiture.com - built with Beaver Builder.

#### What I expected

Smooth minor update
#### What happened instead

Full width designs got messed up
#### Steps to reproduce the issue

Enable photon. Use beaver builder to add a full width image. (adding a row with a full width image background still works though...)