[horde] error db after upgrade

[Massimo Balestrieri]

I got this error when I try to update db schema:

  ERR: HORDE [horde] SQL QUERY FAILED: SQLSTATE[42S21]: Column already  
exists: 1060 Duplicate column name 'device_policykey'
         ALTER TABLE `horde_activesync_device_users` ADD `device_policykey`
           bigint DEFAULT 0 [pid 6338 on line 553 of  
"/usr/share/php/Horde/Db/Adapter/Base.php"]


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