Fix persistent-test's Init.hs when using WITH_MYSQL.
Fix persistent-test's Init.hs when using WITH_MYSQL.

mkscrg/persistent,nakaji-dayo/persistent,nakaji-dayo/persistent,naushadh/persistent,andrewthad/persistent,pseudonom/persistent,mitchellwrosen/persistent,bitemyapp/persistent,meteficha/persistent,mkscrg/persistent,pseudonom/persistent,jasonzoladz/persistent,jcristovao/persistent,erikd/persistent,yesodweb/persistent,meteficha/persistent,gbwey/persistent,andrewthad/persistent,jcristovao/persistent,mitchellwrosen/persistent,superduper/persistent,rdnetto/persistent,mitchellwrosen/persistent,superduper/persistent,gbwey/persistentold,plow-technologies/persistent,jcristovao/persistent,gbwey/persistentold,gbwey/persistent,gbwey/persistent,greydot/persistent,rdnetto/persistent,andrewthad/persistent,paul-rouse/persistent,junjihashimoto/persistent,mkscrg/persistent,meteficha/persistent,creichert/persistent,greydot/persistent,jasonzoladz/persistent,superduper/persistent,jasonzoladz/persistent,greydot/persistent,junjihashimoto/persistent,psibi/persistent,nakaji-dayo/persistent