Fixes 'add-simulated-synopsis-visits' command not accepting custom number of entries
Fixes 'add-simulated-synopsis-visits' command not accepting custom number of entries

Auditors: @mrose17

Test Plan:
- npm run add-simulated-synopsis-visits 1000
- shold add 1000 visits into the ledger

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