Don't unconditionally call `preventDefault` and `stopPropagation` on all keyup events...

Don't unconditionally call `preventDefault` and `stopPropagation` on all keyup events (#4777)

* UploadArea should only preventDefault for Escape

This will make accessibility for some things less effortful, since we won't have to define a prior event handler to do whatever should be happening by default.

* Remove workaround for fixed bug in SettingToggle

SettingToggle was toggling itself in response to keydown of space, and then the keyup was doing it again