feat(test): use common function to launch the browser

addons/xterm-addon-serialize/test/SerializeAddon.api.ts

@@ -4,7 +4,7 @@
  */
 
 import { assert } from 'chai';
-import { openTerminal, writeSync, getBrowserType } from '../../../out-test/api/TestUtils';
+import { openTerminal, writeSync, launchBrowser } from '../../../out-test/api/TestUtils';
 import { Browser, Page } from 'playwright';
 
 const APP = 'http://127.0.0.1:3001/test';
@@ -38,10 +38,7 @@ async function testSerializeEquals(writeContent: string, expectedSerialized: str
 
 describe('SerializeAddon', () => {
   before(async function(): Promise<any> {
-    const browserType = getBrowserType();
-    browser = await browserType.launch({
-      headless: process.argv.includes('--headless')
-    });
+    browser = await launchBrowser();
     page = await (await browser.newContext()).newPage();
     await page.setViewportSize({ width, height });
     await page.goto(APP);