Allow edit item button outside Web Spotlight

[pokornyd]

Motivation

Edit item is effectively a superset of Edit element, the latter being available both in WSL and standard preview. As such, it would make sense to allow Edit item to be rendered in preview as well, as a similar functionality can be achieved by using the first element of an item to render Edit element button, which seems like an unnecessary workaround.

Proposed solution

Make Edit item button available outside web spotlight context.