fix(tauri.js) `writeFile` and `writeBinaryFile` API (#857)

.changes/fix-fs-api.md

@@ -0,0 +1,5 @@
+---
+"tauri.js": patch
+---
+
+Fixes the `writeFile` and `writeBinaryFile` usage.

cli/tauri.js/api-src/fs.ts

@@ -96,7 +96,7 @@ async function writeFile(file: FsTextFileOption, options: FsOptions = {}): Promi
 
   return await promisified({
     cmd: 'writeFile',
-    file: file.path,
+    path: file.path,
     contents: file.contents,
     options
   })
@@ -155,7 +155,7 @@ async function writeBinaryFile(file: FsBinaryFileOption, options: FsOptions = {}
 
   return await promisified({
     cmd: 'writeFile',
-    file: file.path,
+    path: file.path,
     contents: arrayBufferToBase64(file.contents),
     options
   })