test: fix contextIsolation value for later added test (#27998)

spec-main/fixtures/apps/quit/main.js

@@ -1,7 +1,13 @@
 const { app, BrowserWindow } = require('electron');
 
 app.once('ready', () => {
-  const w = new BrowserWindow({ show: false, webPreferences: { nodeIntegration: true } });
+  const w = new BrowserWindow({
+    show: false,
+    webPreferences: {
+      contextIsolation: false,
+      nodeIntegration: true
+    }
+  });
   w.webContents.once('crashed', () => {
     app.quit();
   });