Minimum publisher visit default now 1

[mrose17]

Fixes #6941

Test Plan

1. start the browser with a new session, verify that the advanced settings shows '1' for relevancy
2. change the value, close the window, open it again, verify the change took.
3. quit the browser, start the browser, verify the change is still there.

[bsclifton]

I had to add a missing value (see commit), but otherwise LGTM 😄

[bsclifton]

Proof that it works and that I ran the code:

[luixxiul]

Note: https://github.com/bsclifton/browser-laptop/commit/95426b6133e4542f7819da0ef36f1328cb1a5149 intends to fix https://travis-ci.org/brave/browser-laptop/builds/197205697#L4681

  9) PaymentsTab component advanced ledger settings content defaults to 5 minimum publisher visits:
     AssertionError: '1' == 5
      at Context.<anonymous> (test/unit/app/renderer/paymentsTabTest.js:222:14)
      at Test.Runnable.run (node_modules/co-mocha/lib/co-mocha.js:43:16)