fix(fs): fix writeFile converting UTF-8 characters in path into replacement character (#1965)

.changes/fs-writeTextFile-utf8-path.md

@@ -0,0 +1,5 @@
+---
+"fs-js": "patch"
+---
+
+Fix `writeTextFile` converting UTF-8 characters (for example `äöü`) in the given path into replacement character (`�`)

plugins/fs/guest-js/index.ts

@@ -1072,7 +1072,7 @@ async function writeTextFile(
 
   await invoke('plugin:fs|write_text_file', encoder.encode(data), {
     headers: {
-      path: path instanceof URL ? path.toString() : path,
+      path: encodeURIComponent(path instanceof URL ? path.toString() : path),
       options: JSON.stringify(options)
     }
   })