[bug] remove old code for sync deferred db init

The database initialization on the client sync module is deferred to another
thread. As there is only one thread in the thread pool, this should not be a
problem for now, as operations will actually be queued in that thread. There
was some old code left from when we had to explicitelly wait for the db to be
initialize before using it. This commit removes that old code and introduces
some documentation so we remember to deal with deferred db init if we ever
change the number of threads in the thread pool.

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