test/cleanup: Fix style [Linux]
test/cleanup: Fix style [Linux]

Fix Use min_by instead of sort_by...[0].

hanxue/linuxbrew,maxim-belkin/brew,Linuxbrew/brew,hanxue/linuxbrew,maxim-belkin/brew,Linuxbrew/brew,Linuxbrew/brew,hanxue/linuxbrew,maxim-belkin/brew,Linuxbrew/brew