synopsis entry should show up in < 8s for tests

[diracdeltas]

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yes

Describe the issue you encountered:
when process.env.NODE_ENV === 'test' and a page is visited, it takes 8 seconds for a page to be registered in the ledger, which makes it impossible to test because the test timeout is less than 8s. i thought this was fixed by e47c28b but apparently not.

to repro:

1. mkdir ~/.brave-test-ledger
2. NODE_ENV=test npm start
3. open the payments panel, visit any site, observe that it takes at least 8s for it to appear in the synopsis table

[mrose17]

@diracdeltas - still looking into this, but. if you do NODE_ENV=test ..., then everything in the browser EXCEPT the ledger file are in ~/Application\ Support/brave-test/ -- but the ledger files are looked for in ~/.brave-test-ledger/, but that directory is never created automatically. i'm going to address that in the PR associated with this issue.

[diracdeltas]

@mrose17 the testing framework doesn't know where appData is so it has to use ~/. the directory is made automatically by the test setup script, so make sure to change test/lib/brave.js accordingly if you make any changes.