dofs: Organize readdir test imports

Keep the new pagination tests compliant with the repository-wide Biome
import ordering check.

Author: aron-cf

packages/dofs/src/fs/readdir.test.ts

@@ -6,9 +6,9 @@ import { withDB } from "./with-db.js";
 import {
   openWriteBufferForCreateSync,
   releaseWriteBufferSync,
+  writeFile,
   writeRangeSync,
 } from "./writeFile.js";
-import { writeFile } from "./writeFile.js";
 
 describe("readdir", () => {
   it("returns an empty array for an empty directory", async () => {