Unlocking levels Bug when not follow_wanikani

[tadgh]

There is currently some shared logic between sync, and level unlock, which first checks if a user has follow_me enabled, and if they do not, the level unlocker quite literally ignores. This can be seen in process_vocabulary_response_for_user_v2 in WanikaniUserSyncerV2 https://github.com/Kaniwani/kw-backend/blob/master/api/sync/WanikaniUserSyncerV2.py#L132 , called by https://github.com/Kaniwani/kw-backend/blob/master/api/sync/WanikaniUserSyncerV2.py#L286

The fix is to divorce the logic between sync and manual unlock. This must be a regression for the V2 syncer as this used to work.