rust: pin-init: internal: init: use `slot` identifier directly with mixed site

Use `quote_spanned!(Span::mixed_site() => ...)` directly instead of
creating `slot` identifier and interpolate it later. Do the same for
`__data`, too.

This is needed so that we can customize the location of the span without
having the `slot` identifier getting in the way. For example:

    quote_spanned!(Span::mixed_site().located_at(loc) => ...)

with `slot` mentioned directly will have the diagnostic pointing to the
desired location, while `#slot` won't.

Link: https://patch.msgid.link/20260916-dev-hygiene-v1-2-dfb6ae2588ba@garyguo.net
Signed-off-by: Gary Guo <gary@garyguo.net>

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