Remove ratio condition for Lightbox

[paperboyo]

This allows Lightbox to be opened irregardless of image ratio. IMHO, the condition never made much sense, was put in allegedly to prevent opening looong cartoons which would be unreadable when shrank to vh, but:

• these cartoons are often interactives anyway (so Lightbox is not available)
• one doesn’t have to open the Lightbox, if scrolling is preferable, one can do that
• we shrink images to vh in galleries without asking anyone (and we are right)
• the ratio in place was too broad anyway
• the condition prevents me from being able to appreciate good photography

Will fix half of #19768, undoes part of #7647.

Next: #12215

Does this affect other platforms?

• AMP
• Apps
• Other (please specify)
• Nope

Does this affect GLabs Paid Content Pages? Should it have support for Paid Content?

• No (only in a good way)
• Yes (please give details)

Does this change break ad-free?

• No
• It did, but tests caught it and I fixed it
• It did, but there was no test coverage so I added that then fixed it

Accessibility test checklist

• Tested with screen reader
• Navigable with keyboard
• Colour contrast passed

Tested

• Locally
• On CODE (optional)

[paperboyo]

Closed in favour of #20522.