fix(fs): use correct arg name for unwatch (#857)

* fix(fs): use correct arg name for unwatch

* fmt

.changes/fs-unwtach-rid.md

@@ -0,0 +1,5 @@
+---
+"fs-js": "patch"
+---
+
+Fix `invalid args id for command unwatch` error when trying to unwatch a previously watched file or directory.

plugins/fs/guest-js/index.ts

@@ -1135,8 +1135,8 @@ type DebouncedEvent =
  */
 type UnwatchFn = () => void;
 
-async function unwatch(id: number): Promise<void> {
+async function unwatch(rid: number): Promise<void> {
-  await invoke("plugin:fs|unwatch", { id });
+  await invoke("plugin:fs|unwatch", { rid });
 }
 
 /**