Remove an AFIT test that isn't an AFIT test

tests/ui/async-await/in-trait/async-associated-types2.rs

@@ -1,30 +0,0 @@
-// check-pass
-// edition: 2021
-// [next] compile-flags: -Zlower-impl-trait-in-trait-to-assoc-ty
-// revisions: current next
-
-#![feature(async_fn_in_trait)]
-#![feature(impl_trait_in_assoc_type)]
-#![allow(incomplete_features)]
-
-use std::future::Future;
-
-trait MyTrait {
-    type Fut<'a>: Future<Output = i32>
-    where
-        Self: 'a;
-
-    fn foo<'a>(&'a self) -> Self::Fut<'a>;
-}
-
-impl MyTrait for i32 {
-    type Fut<'a> = impl Future<Output = i32> + 'a
-    where
-        Self: 'a;
-
-    fn foo<'a>(&'a self) -> Self::Fut<'a> {
-        async { *self }
-    }
-}
-
-fn main() {}