Revert "Move negative_impls test from run-pass to ui"

This reverts commit 836eb25.

Author: taiki-e

…s/ui/unstable-features/negative_impls.rs tests/run-pass/negative_impls.rstests/ui/unstable-features/negative_impls.rs renamed to tests/run-pass/negative_impls.rs tests/ui/unstable-features/negative_impls.rs renamed to tests/run-pass/negative_impls.rs

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: Apache-2.0 OR MIT
 
 #![feature(negative_impls)]
-#![deny(suspicious_auto_trait_impls)]
 
 // https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/design.20meeting.3A.20backlog.20bonanza/near/269471299
 // https://github.com/taiki-e/pin-project/issues/340