folder_branch_ops: update all deCache entries in notifyOp
folder_branch_ops: update all deCache entries in notifyOp

So that it works well with op inversion (and maybe eventually applying
updates with outstanding dirty writes).

Issue: KBFS-464

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