Make sure img tags get the width and height set in the editor, for utilizing on-the-fly resizing capabilities, such as Jetpack's

[asafm7]

Currently, when setting width and height for an image in the editor, only the wrapping figure element gets the value, and not the actual img element.

This prevents utilizing on-the-fly resizing capabilities, such as Jetpack's:

https://jetpack.com/support/site-accelerator/#:~:text=It%20looks%20at%20the%20img%20element%E2%80%99s%20width%20and%20height%20attributes