* Update grid blocks preview to match width of products on the front end
* Remove max-width from CSS, set it on the preview itself so we can use the dynamic theme width
* Override block thumbnail width for multiple column layouts
Previously larger thumbnails would cause multiple column layouts to break and wrap early. This enforces the column width for those cases
* Add the thumbnail size to images, to prevent larger images in multiple col layouts
* Update snapshot to new preview markup
d2f1aa6c44