Added .5em margin around .autofillList
Added .5em margin around .autofillList

Closes #6328

Auditors:

Test Plan:
1. Open about:autofill
2. Delete entries if any
3. Make sure padding exists around the "No saved addresses/credit cards"
4. Add an entry
5. Select the entry on hover
6. Make sure padding exists between the list and the button

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