fix: change testDir path

Fix #46.

Author: simonberner

playwright.config.js

@@ -1,7 +1,7 @@
 import { defineConfig, devices } from "@playwright/test";
 
 export default defineConfig({
-  testDir: "tests/playwright",
+  testDir: "./tests/playwright",
   /* Run tests in files in parallel */
   fullyParallel: true,
   /* Fail the build on CI if you accidentally left test.only in the source code. */