fix drop database statement in DB2
fix drop database statement in DB2

janschoenherr/dbal,PowerKiKi/dbal,wuxu92/dbal,drieschel/dbal,stof/dbal,arima-ryunosuke/dbal,kimhemsoe/dbal,cassvail/dbal,Tobion/dbal,lcobucci/dbal,bspeterson/dbal,mRoca/dbal,doctrine/dbal,webonyx/dbal,BenMorel/dbal,lafourchette/dbal,deeky666/dbal,BenMorel/dbal,PowerKiKi/dbal,tk-s/dbal,DHager/dbal,adrienbrault/dbal,v-bartusevicius/dbal,mihai-stancu/dbal,vutung2311/dbal,DHager/dbal,mihai-stancu/doctrine-dbal,cassvail/dbal,LionwareSolutions/dbal,mikeSimonson/dbal,Tobion/dbal,mathroc/dbal,AlexDpy/dbal,arima-ryunosuke/dbal,helicon-os/doctrine-dbal,v-bartusevicius/dbal,kupishkis/dbal,adrienbrault/dbal,adrienbrault/dbal,mRoca/dbal,hason/dbal,drieschel/dbal,kimhemsoe/dbal,sarcher/dbal,nfrignani/dbal,lcobucci/dbal,gencer/dbal,mihai-stancu/dbal,mihai-stancu/doctrine-dbal,janschoenherr/dbal,hason/dbal,helicon-os/doctrine-dbal,webonyx/dbal,sarcher/dbal,shivergard/dbal,vortgo/dbal,sarcher/dbal,kupishkis/dbal,easybiblabs/dbal,nfrignani/dbal,mariuz/dbal,arima-ryunosuke/dbal,vutung2311/dbal,stchr/dbal,mbeccati/dbal,hason/dbal,PowerKiKi/dbal,deeky666/dbal,mbeccati/dbal,wuxu92/dbal,bspeterson/dbal,LionwareSolutions/dbal,mikeSimonson/dbal,stchr/dbal,zeroedin-bill/dbal,shivergard/dbal,zeroedin-bill/dbal,easybiblabs/dbal,kupishkis/dbal,tk-s/dbal,AlexDpy/dbal,webonyx/dbal,doctrine/dbal,vortgo/dbal,mariuz/dbal,mathroc/dbal,stof/dbal,gencer/dbal,easybiblabs/dbal,lafourchette/dbal,LionwareSolutions/dbal,mariuz/dbal