Fix Height Value Doing Nothing in Image Blocks

[thexavismith]

What?

Removes the height: auto CSS that is currently overriding the height value in the editor.

Why?

This issue was originially reported in the WP Calypso repo, but it was determined that the fix needed to be here: Automattic/wp-calypso#61744

How?

This PR only applies height: auto if both width and height are set to preserve the aspect ratio.

Testing Instructions

1. Create a post or page
2. Add an image and edit both the width and height
3. Verify that the CSS recognizes this and adds height: auto to preserve aspect ratio on the frontend
4. Add an image and edit just the height
5. Verify that the image on the frontend is the size set but with a preserved aspect ratio

Screenshots or screencast

[github-actions]

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[Mamaduka]

Thanks for contributing, @thexavismith!

I can no longer reproduce the bug. I believe this was resolved in recent WP versions when aspect-ration controls were introduced. Ref: #52286.

I'm going to close the PR.