cherry-pick(#33030): fix(ui): bring back the headed param

Author: pavelfeldman

packages/playwright/src/runner/testServer.ts

@@ -302,10 +302,11 @@ export class TestServerDispatcher implements TestServerInterface {
       preserveOutputDir: true,
       reporter: params.reporters ? params.reporters.map(r => [r]) : undefined,
       use: {
-        ...(this._configCLIOverrides.use || {}),
-        trace: params.trace === 'on' ? { mode: 'on', sources: false, _live: true } : (params.trace === 'off' ? 'off' : undefined),
-        video: params.video === 'on' ? 'on' : (params.video === 'off' ? 'off' : undefined),
-        headless: params.headed ? false : undefined,
+        ...this._configCLIOverrides.use,
+        ...(params.trace === 'on' ? { trace: { mode: 'on', sources: false, _live: true } } : {}),
+        ...(params.trace === 'off' ? { trace: 'off' } : {}),
+        ...(params.video === 'on' || params.video === 'off' ? { video: params.video } : {}),
+        ...(params.headed !== undefined ? { headless: !params.headed } : {}),
         _optionContextReuseMode: params.reuseContext ? 'when-possible' : undefined,
         _optionConnectOptions: params.connectWsEndpoint ? { wsEndpoint: params.connectWsEndpoint } : undefined,
       },