[Rust] export_cabi codegen bug

[chenyan2002]

Consider this WIT

package test:test;

interface original {
  resource extra-options;
  record options {
    extra: option<borrow<extra-options>>,
  }
}

interface adapter {
  use original.{options};
  f: func(x: options);
}

world root {
  export original;
  export adapter;
}

wit-bindgen generates this code for adapter interface,

pub mod adapter {
  pub type Options<'a,> = super::super::super::super::exports::test::test::original::Options<'a,>;
  pub unsafe fn _export_f_cabi<T: Guest>(arg0: i32,arg1: i32,) {
    ...
      let e = ExtraOptionsBorrow::lift(arg1 as u32 as usize);
    ...
  }
}

ExtraOptionsBorrow needs to use relative path, otherwise the code won't compile.
If the world doesn't export original, the generated code is using the relative path correctly.