Support ReScript 11's uncurried mode

[fhammerschmidt]

ReScript 11 introduces uncurried mode which sacrifices automatic partial application for an explicit syntax.

However, libraries probably should not switch to it (yet). If I changed everything to

let active = pseudoClass("active", ...)

this project would not build anymore for ReScript < 11 users.

So the saner thing to do was to just unwrap all calls and explicitly put the arg there.

[giraud]

thanks