Update EntityDescription.ts

[mfarmer-ara]

Removes assumption that the infobox always has the bodyless class.

From looking at the infobox behavior it looks like the bodyless class isn't always present when you click different entities. Removing it fixed the issues detailed in https://github.com/reearth/resium/issues/628

Tested both on my local environment using Resium as well as the story noted in the issue that exhibited similar behavior.

closes #628

[mfarmer-ara]

Updated branch to be on latest, is this able to get merged? While we have a workaround it's not ideal.

Thanks!

[keiya01]

@mfarmer-ara We've released your change in v1.18.0. Thank you!