Use correct tabByIndex in autofill tests
Use correct tabByIndex in autofill tests

Auditors: @bsclifton

This probably broke because we weren't finding about prefrences tabs correctly before in tabByIndex calls.  Since we fixed that, we need to fix wrong callers using wrong a wrong index. There might be follow up similar things that need fixing

jonathansampson/browser-laptop,pmkary/braver,jonathansampson/browser-laptop,darkdh/browser-laptop,timborden/browser-laptop,diasdavid/browser-laptop,willy-b/browser-laptop,jonathansampson/browser-laptop,timborden/browser-laptop,diasdavid/browser-laptop,darkdh/browser-laptop,diasdavid/browser-laptop,dcposch/browser-laptop,willy-b/browser-laptop,darkdh/browser-laptop,pmkary/braver,timborden/browser-laptop,luixxiul/browser-laptop,willy-b/browser-laptop,luixxiul/browser-laptop,willy-b/browser-laptop,diasdavid/browser-laptop,darkdh/browser-laptop,luixxiul/browser-laptop,pmkary/braver,timborden/browser-laptop,jonathansampson/browser-laptop,pmkary/braver,dcposch/browser-laptop,dcposch/browser-laptop,luixxiul/browser-laptop,dcposch/browser-laptop