Revert "tail: disable clippy::assigning_clones on OpenBSD"

This reverts commit 14258b1.

Author: xtqqczze

src/uu/tail/src/follow/watch.rs

@@ -47,9 +47,7 @@ impl WatcherRx {
             Tested for notify::InotifyWatcher and for notify::PollWatcher.
             */
             if let Some(parent) = path.parent() {
-                // clippy::assigning_clones added with Rust 1.78
-                // Rust version = 1.76 on OpenBSD stable/7.5
-                #[cfg_attr(not(target_os = "openbsd"), allow(clippy::assigning_clones))]
+                #[allow(clippy::assigning_clones)]
                 if parent.is_dir() {
                     path = parent.to_owned();
                 } else {