Don't do needless error handling around tx.Done()
Created by: mrnugget
As it turns out, tx.Done(err)
already does what the code here
previously did: https://github.com/sourcegraph/sourcegraph/blob/b11636e4eb53ff6698fbd0ab4da7c7eac3496a1e/internal/database/basestore/store.go#L125-L132