wasm: use thread::sleep on non-wasi wasm too (#4963)

Co-authored-by: Taiki Endo <[email protected]>

tokio/src/park/thread.rs

@@ -64,10 +64,10 @@ impl Park for ParkThread {
     }
 
     fn park_timeout(&mut self, duration: Duration) -> Result<(), Self::Error> {
-        // Wasi doesn't have threads, so just sleep.
-        #[cfg(not(tokio_wasi))]
+        // Wasm doesn't have threads, so just sleep.
+        #[cfg(not(tokio_wasm))]
         self.inner.park_timeout(duration);
-        #[cfg(tokio_wasi)]
+        #[cfg(tokio_wasm)]
         std::thread::sleep(duration);
         Ok(())
     }