Don't auto-tap caskroom/cask in ZSH completion
Don't auto-tap caskroom/cask in ZSH completion

The Bash completion just uses the directory tree rather than invoking
`brew cask`, so doesn't exhibit the same behaviour.

ilovezfs/brew,DomT4/brew,nandub/brew,reelsense/brew,JCount/brew,MikeMcQuaid/brew,mahori/brew,konqui/brew,maxim-belkin/brew,mgrimes/brew,EricFromCanada/brew,MikeMcQuaid/brew,reitermarkus/brew,Homebrew/brew,vitorgalvao/brew,reelsense/brew,hanxue/linuxbrew,EricFromCanada/brew,konqui/brew,ilovezfs/brew,reitermarkus/brew,alyssais/brew,hanxue/linuxbrew,ilovezfs/brew,sjackman/homebrew,claui/brew,MikeMcQuaid/brew,reelsense/brew,reitermarkus/brew,EricFromCanada/brew,EricFromCanada/brew,Homebrew/brew,claui/brew,sjackman/homebrew,mgrimes/brew,sjackman/homebrew,sjackman/homebrew,vitorgalvao/brew,maxim-belkin/brew,Linuxbrew/brew,mahori/brew,pseudocody/brew,Linuxbrew/brew,JCount/brew,reitermarkus/brew,pseudocody/brew,konqui/brew,Linuxbrew/brew,Homebrew/brew,JCount/brew,nandub/brew,vitorgalvao/brew,nandub/brew,claui/brew,claui/brew,nandub/brew,hanxue/linuxbrew,pseudocody/brew,DomT4/brew,DomT4/brew,alyssais/brew,Homebrew/brew,Linuxbrew/brew,mahori/brew,maxim-belkin/brew,konqui/brew,JCount/brew,alyssais/brew,mahori/brew,mgrimes/brew,vitorgalvao/brew,MikeMcQuaid/brew,DomT4/brew