brew.fish: pass `--formula` to `brew list`.
brew.fish: pass `--formula` to `brew list`.

`--formula` is now required for `brew list`, otherwise an error message
is printed.

Fixes #9017

EricFromCanada/brew,Homebrew/brew,MikeMcQuaid/brew,nandub/brew,reitermarkus/brew,konqui/brew,MikeMcQuaid/brew,JCount/brew,vitorgalvao/brew,Homebrew/brew,konqui/brew,claui/brew,MikeMcQuaid/brew,nandub/brew,reitermarkus/brew,nandub/brew,sjackman/homebrew,reitermarkus/brew,EricFromCanada/brew,claui/brew,sjackman/homebrew,Homebrew/brew,vitorgalvao/brew,JCount/brew,EricFromCanada/brew,JCount/brew,reitermarkus/brew,konqui/brew,sjackman/homebrew,sjackman/homebrew,konqui/brew,vitorgalvao/brew,claui/brew,Homebrew/brew,MikeMcQuaid/brew,EricFromCanada/brew,nandub/brew,vitorgalvao/brew,claui/brew,JCount/brew