“Copy item path to clipboard” button gives wrong string for modules

[steffahn]

Compare e..g https://doc.rust-lang.org/1.81.0/std/boxed/index.html, where the button correctly produces std::boxed in the clipboard,
with https://doc.rust-lang.org/nightly/std/boxed/index.html, where it currently gives me std::std::boxed instead!

I would guess, this is a change that came with the redesign in #129545, though I haven’t checked to confirm that.

This only happen with modules; things like structs, macros, type synonyms… als seem to work correctly.

cc @GuillaumeGomez, @notriddle

@rustbot label +T-rustdoc +T-rustdoc-frontend +A-rustdoc-ui

[clubby789]

        const path = [];
        onEachLazy(document.querySelectorAll(".rustdoc-breadcrumbs a"), a => {
            path.push(a.textContent);
        });
        path.push(document.querySelector("title").textContent.split(" ")[0]);

Most pages have the title <Item> in path::to::module - but modules don't have this, so the title of the page is just appended to std.
@rustbot claim