reverted and fixed current_auth booleans

[iambibhas]

if g.user:                   -   if current_auth.not_anonymous
if not g.user:               -   if current_auth.is_anonymous
if g.user or g.anon_user:    -   if current_auth.is_authenticated
if g.anon_user:              -   if current_auth.is_authenticated and current_auth.is_anonymous

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