Drop nonexistent `brew cask cleanup` completions
Drop nonexistent `brew cask cleanup` completions

vitorgalvao/brew,EricFromCanada/brew,mahori/brew,konqui/brew,reitermarkus/brew,MikeMcQuaid/brew,konqui/brew,MikeMcQuaid/brew,Homebrew/brew,JCount/brew,sjackman/homebrew,Homebrew/brew,nandub/brew,nandub/brew,nandub/brew,sjackman/homebrew,vitorgalvao/brew,MikeMcQuaid/brew,vitorgalvao/brew,claui/brew,mahori/brew,claui/brew,EricFromCanada/brew,mahori/brew,reitermarkus/brew,reitermarkus/brew,Homebrew/brew,MikeMcQuaid/brew,konqui/brew,claui/brew,Homebrew/brew,JCount/brew,claui/brew,EricFromCanada/brew,JCount/brew,JCount/brew,sjackman/homebrew,reitermarkus/brew,EricFromCanada/brew,vitorgalvao/brew,mahori/brew,konqui/brew,sjackman/homebrew,nandub/brew