kbfsblock: update QuotaInfo for git blocks
kbfsblock: update QuotaInfo for git blocks

Issue: KBFS-2366

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