b4 tui: Old serieses not removed

Hi,

As part of an effort to sync review state between machines I have
arranged for the set of b4/review branches on the destination machine to
be the same as it was on the source.  When I open b4 tui and run 'U' to
update all branches it reports the existance of several hundred more
branches, looking at them going past and what's in the UI I think most
but not all of them are thanked branches which I later archived on the
source machine, the branches are gone but they remain in the UI.

Thanks,
Mark

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