ffmpeg: fix HEAD install (#94706)
ffmpeg: fix HEAD install (#94706)

This commit: https://github.com/FFmpeg/FFmpeg/commit/3d29724c008d8f27fecf85757152789b074e8ef9
upgrades libvmaf to v2.0.0 thus the workaround in the formula is no
longer needed.
Homebrew/homebrew-core,sjackman/homebrew-core,cblecker/homebrew-core,lemzwerg/homebrew-core,zyedidia/homebrew-core,stgraber/homebrew-core,makigumo/homebrew-core,nbari/homebrew-core,cblecker/homebrew-core,nbari/homebrew-core,chrisfinazzo/homebrew-core,mfikes/homebrew-core,sjackman/homebrew-core,uyjulian/homebrew-core,nandub/homebrew-core,filcab/homebrew-core,stgraber/homebrew-core,uyjulian/homebrew-core,adam-moss/homebrew-core,chrisfinazzo/homebrew-core,adam-moss/homebrew-core,makigumo/homebrew-core,nandub/homebrew-core,Homebrew/homebrew-core,filcab/homebrew-core,mfikes/homebrew-core,zyedidia/homebrew-core,lemzwerg/homebrew-core