fix(playwright): remove unnecessary awaits (#1239)

`page.locator` is a synchronous method.

playwright-tests/fullstack.spec.js

@@ -9,7 +9,7 @@ test('button click', async ({ page }) => {
   await expect(main).toContainText('hello axum! 12345');
 
   // Click the increment button.
-  let button = await page.locator('button.increment-button');
+  let button = page.locator('button.increment-button');
   await button.click();
 
   // Expect the page to contain the updated counter text.
@@ -24,7 +24,7 @@ test('fullstack communication', async ({ page }) => {
   await expect(main).toContainText('Server said: ...');
 
   // Click the increment button.
-  let button = await page.locator('button.server-button');
+  let button = page.locator('button.server-button');
   await button.click();
 
   // Expect the page to contain the updated counter text.

playwright-tests/web.spec.js

@@ -9,7 +9,7 @@ test('button click', async ({ page }) => {
   await expect(main).toContainText('hello axum! 0');
 
   // Click the increment button.
-  let button = await page.locator('button.increment-button');
+  let button = page.locator('button.increment-button');
   await button.click();
 
   // Expect the page to contain the updated counter text.
@@ -80,7 +80,7 @@ test('eval', async ({ page }) => {
   await expect(div).toHaveText('');
 
   // Click the button to run the eval.
-  let button = await page.locator('button.eval-button');
+  let button = page.locator('button.eval-button');
   await button.click();
 
   // Check that the title changed.