message: Sync: Only load last 10 days when starting (lib)
  Fixes
diff: @@ -5404,6 +5404,11 @@ error Context::pullBatchedUserData() {
  if (user_->HasValidSinceDate()) {
  since = user_->Since();
  }
  + else {
  + // just pull the last 10 days on full sync
  + since = time(nullptr) - 10 * 24 * 60 * 60;
  + user_->HasLoadedMore.Set(false);
  + }
  }
  if (api_token.empty()) {
  