FormulaInstaller: link tmp kegs during rescue
FormulaInstaller: link tmp kegs during rescue

In #6807, the FormulaInstaller began to rescue from
FormulaInstallationAlreadyAttemptedError but there is the
potential for tmp kegs to remain unlinked in the cellar.
I've merged the rescue statements so they both re-link tmp
kegs, but it doesn't raise for
FormulaInstallationAlreadyAttemptedError.

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