fix(vace): auto-convert 3-channel RGB depth masks to single-channel grayscale (#908)#909

livepeer-tessa wants to merge 2 commits intomaindaydreamlive/scope:mainfrom

fix/908-vace-rgb-depth-mask-channeldaydreamlive/scope:fix/908-vace-rgb-depth-mask-channelCopy head branch name to clipboard