bump-formula-pr: always use base if unforkable
bump-formula-pr: always use base if unforkable

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