composer: fix style (#81938)
composer: fix style (#81938)

The `on_macos` block was added in #81548, while the `uses_from_macos`
line was added in #81508. Having both in the formulae wasn't tested
until both PRs were merged to master.
makigumo/homebrew-core,uyjulian/homebrew-core,stgraber/homebrew-core,mfikes/homebrew-core,mbcoguno/homebrew-core,cblecker/homebrew-core,stgraber/homebrew-core,mfikes/homebrew-core,Homebrew/homebrew-core,lemzwerg/homebrew-core,mbcoguno/homebrew-core,zyedidia/homebrew-core,sjackman/homebrew-core,Moisan/homebrew-core,filcab/homebrew-core,uyjulian/homebrew-core,filcab/homebrew-core,Homebrew/homebrew-core,adam-moss/homebrew-core,nandub/homebrew-core,cblecker/homebrew-core,lemzwerg/homebrew-core,mbcoguno/homebrew-core,zyedidia/homebrew-core,nbari/homebrew-core,chrisfinazzo/homebrew-core,Moisan/homebrew-core,chrisfinazzo/homebrew-core,nandub/homebrew-core,adam-moss/homebrew-core,sjackman/homebrew-core,nbari/homebrew-core,makigumo/homebrew-core