update-report: optimise update_report_only_installed code.
update-report: optimise update_report_only_installed code.

nandub/brew,Homebrew/brew,Homebrew/brew,JCount/brew,JCount/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,Homebrew/brew,nandub/brew,nandub/brew,Homebrew/brew,JCount/brew,MikeMcQuaid/brew,MikeMcQuaid/brew,nandub/brew,JCount/brew