set correct hasher when open exist hash tree map
set correct hasher when open exist hash tree map

sumit784/mapdb,hangum/mapdb,jankotek/MapDB,lamfire/mapdb,jankotek/MapDB,SleimanJneidi/mapdb,binarytemple/mapdb,ffjiao/mapdb,cocosli/mapdb,morfeo8marc/mapdb,jankotek/mapdb,pettermahlen/mapdb,jankotek/mapdb,ringoluo/mapdb,codeaudit/mapdb