Images with class size full don't write the class back to the CSS

[SergioEstevao]

Expected behavior

If you insert an image by default the class size should be full and it should output something like this:

<img src="image.jpg" class="size-full">

Actual behavior

It outputs something like this:

<img src="image.jpg" class="">

Steps to reproduce the behavior

• Start the demo app
• Open the empty demo
• Add an image
• tap on image and select full size
• Switch to HTML and see result

Tested on iPhone 7, iOS 11, Aztec beta 14.1