show nothing for siteInfo on about: pages
show nothing for siteInfo on about: pages

fix https://github.com/brave/browser-laptop/issues/8299

Test Plan:
1. open example.com
2. open a new tab
3. show siteInfo on example.com, then use Cmd+2 to switch to the second tab
4. no siteInfo should show on the second tab

luixxiul/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,timborden/browser-laptop,timborden/browser-laptop,diasdavid/browser-laptop,timborden/browser-laptop,luixxiul/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,timborden/browser-laptop