core: Drop the _wrap_value usage

unquote was changed on the sandbox/adderall branch hydiomatic currently
depends on, to call _wrap_value on stuff that is being unquoted, before
returning the unquoted form.

This makes it unnecessary to call it ourselves, so drop the import and
the calls.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>