Photon: disable intermediate image sizes issues

I was testing the new Photon feature: https://github.com/Automattic/jetpack/commit/a8b09618c3e17808b704b4936c9d1dfb6160499d
`add_filter( 'jetpack_photon_noresize_mode', '__return_true' );`

It's a really cool idea, but I did find an issue with how some of the images are being generated with it turned on.

My theme calls for a 218x150 thumbnail, but Photon is using the "w" parameter instead of "resize" for some URLs in the `srcset` markup.

Example:
``

As you can see, most URLs are correctly using "resize". But some use "w", so the wrong image size is being loaded in because it's not accounting for the height. It should be 218x150, but in the example above it's loading in a 218x323 sized image.