[DBClientHatohol] Add a missing table name on querying items

This commit fixes the following fatal error:

[INFO] <FaceRest.cc:705> reply error: 4, HTERR_GOT_EXCEPTION: <DBAgentSQLite3.cc:600> Failed to call sqlite3_prepare(): 1, SELECT items.server_id,items.id,items.host_id,items.brief,items.last_value_time_sec,items.last_value_time_ns,items.last_value,items.prev_value,items.item_group_name,map_hosts_hostgroups.host_group_id,hostgroups.group_name FROM  items inner join map_hosts_hostgroups on ((items.host_id=map_hosts_hostgroups.host_id) and (items.server_id=map_hosts_hostgroups.server_id)) inner join hostgroups on ((items.server_id=hostgroups.server_id) and (map_hosts_hostgroups.host_group_id=hostgroups.host_group_id)) WHERE (server_id=1)