Twenty Seventeen: Make entering or deleting a video in youtube-field more user-friendly

[Presskopp]

In Twenty Seventeen, when entering a youtube video for header, and pressing return, nothing happens. I'd like if this would activate the video (same when you delete it)

I asked that in Slack and was asked to open this ticket by @davidakennedy

@celloexpressions says: "Sounds like a possible enhancement for the core customize input control, I believe it fires a refresh on change currently."

[westonruter]

This will be resolved by switching to use the input event instead of the change event. See #35832.