Revert the two compat tests for the export syntax change

Reverts the compat tests for #95 (closed), which we no longer need since we're no longer trying to be compatible.

tests/expand/clone.expanded.rs

 //! Very simple example for deriving Clone.
-use derive_deftly::{self, define_derive_deftly, Deftly};
+use derive_deftly::{define_derive_deftly, Deftly};
 use std::sync::Arc;
 #[derive_deftly(MyClone)]
 struct DecoratedError<E> {