Fixed broken scala-js build due to renaming of Rnd to Randomizer.
Fixed broken scala-js build due to renaming of Rnd to Randomizer.

dotty-staging/scalatest,scalatest/scalatest,cheeseng/scalatest,dotty-staging/scalatest,cheeseng/scalatest,cheeseng/scalatest,scalatest/scalatest,scalatest/scalatest,dotty-staging/scalatest