Removed some unneeded overloads from Unary_!.
Removed some unneeded overloads from Unary_!.

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