folder_branch_ops: GetEditHistory should wait on outstanding edits
folder_branch_ops: GetEditHistory should wait on outstanding edits

Make sure we return the most recent history, including the
initialization.

Issue: KBFS-2997

keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/kbfs