[keyserver] fix db setup

Summary:
don't use fetchCallUpdateOlmAccount from verifyUserLoggedInWithoutDB

resolves https://linear.app/comm/issue/ENG-9583/running-keyserver-with-fresh-db-is-broken

Test Plan: i'm able to set up a fresh keyserver with no issues

Reviewers: inka, kamil, ashoat

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13693