fix: permissions in mobile and geolocation example (#1667)

README.md

@@ -64,7 +64,7 @@ const iPhone11 = devices['iPhone 11 Pro'];
  viewport: iPhone11.viewport,
  userAgent: iPhone11.userAgent,
  geolocation: { longitude: 12.492507, latitude: 41.889938 },
- permissions: { 'https://www.google.com': ['geolocation'] }
+ permissions: ['geolocation']
  });
  const page = await context.newPage();
  await page.goto('https://maps.google.com');