remote-test-server: apply considerable clippy suggestions

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/tools/remote-test-server/src/main.rs

@@ -282,7 +282,7 @@ fn handle_run(socket: TcpStream, work: &Path, tmp: &Path, lock: &Mutex<()>, conf
     cmd.env(library_path, env::join_paths(paths).unwrap());
 
     // Some tests assume RUST_TEST_TMPDIR exists
-    cmd.env("RUST_TEST_TMPDIR", tmp.to_owned());
+    cmd.env("RUST_TEST_TMPDIR", tmp);
 
     let socket = Arc::new(Mutex::new(reader.into_inner()));