Remove max-width setting on image-block (#14911)

This seems like a job for the align classes. 
I'm not seeing `max-width` set for any other blocks.

Also, it overrides my theme's   `article > * { max-width: $width; }`

packages/block-library/src/image/style.scss

@@ -1,6 +1,4 @@
 .wp-block-image {
-	max-width: 100%;
-
 	// The image block is in a `figure` element, and many themes zero this out.
 	// This rule explicitly sets it, to ensure at least some bottom-margin in the flow.
 	margin-bottom: 1em;