TestSetUniqueTogether: fix sqlite test expectation (force err string to lower)
TestSetUniqueTogether: fix sqlite test expectation (force err string to lower)

losinggeneration/gorp,gabelula/gorp,cortex/gorp,kevinc0825/gorm,xiaoenai/gorp,kimxilxyong/gorp,coopernurse/gorp,gabelula/gorp,kimxilxyong/gorp,mousesun/gorp,losinggeneration/gorp,d-g-laptev/gorp,yp-engineering/gorp,evenco/gorp,coopernurse/gorp,outdoorsy/gorp,go-gorp/gorp,kevinc0825/gorm,mousesun/gorp,evenco/gorp,outdoorsy/gorp,go-gorp/gorp,cortex/gorp,GeertJohan/gorp,xiaoenai/gorp,yp-engineering/gorp,d-g-laptev/gorp,GeertJohan/gorp