[Dovecot] doveadm table formatter: hidden titles may cause misaligned headers

[Julian Reich]

Hello,

I recently noticed a small bug in the doveadm table formatter: hidden titles may cause the headers to be misaligned.
The behavior in question was introduced by commit <http://hg.dovecot.org/dovecot-2.2/rev/210282ae46e1> and
  doveadm -f table quota get -A
may be used to reproduce it.

Most simple patch attached: it simply restores the old behavior, to some extent.
Actually hiding those titles may be desired.

Regards,
Julian Reich
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