Re-sync prayer letters account on 410/404 errors

When a user goes into prayerletters.com and clicks "Delete" on a contact, that will then cause a 410 error on the MPDX sync. After consulting with Steve, it seems the best approach for now is to just resync the whole account when that happens. Tried this locally and once I deleted the contact in PrayerLetters then re-saved it in MPDX, Sidekiq ran a longer job (the fully sync) then the contact re-appeared in PrayerLetters.

There may be some more subtle cases like if two accounts both sync to the same prayer letters account, but this is a step forward for the majority of cases.