options: fix missing leading "--" in output
options: fix missing leading "--" in output

Closes Homebrew/homebrew#14124.

Signed-off-by: Jack Nagel <43386ce32af96f5c56f2a88e458cb94cebee3751@gmail.com>

gregory-nisbet/brew,mahori/brew,maxim-belkin/brew,konqui/brew,ilovezfs/brew,maxim-belkin/brew,gordonmcshane/homebrew,vitorgalvao/brew,staticfloat/brew,AnastasiaSulyagina/brew,AnastasiaSulyagina/brew,nandub/brew,jmsundar/brew,mahori/brew,vitorgalvao/brew,reelsense/brew,zmwangx/brew,staticfloat/brew,pseudocody/brew,sjackman/homebrew,konqui/brew,DomT4/brew,aw1621107/brew,bfontaine/brew,reitermarkus/brew,alyssais/brew,DomT4/brew,gregory-nisbet/brew,muellermartin/dist,bfontaine/brew,hanxue/linuxbrew,toonetown/homebrew,mistydemeo/homebrew,AnastasiaSulyagina/brew,bfontaine/brew,Homebrew/brew,amar-laksh/brew_sudo,claui/brew,staticfloat/brew,MikeMcQuaid/brew,DomT4/brew,muellermartin/dist,aw1621107/brew,Homebrew/brew,palxex/brew,JCount/brew,ilovezfs/brew,jmsundar/brew,mahori/brew,reelsense/brew,sjackman/homebrew,claui/brew,mgrimes/brew,amar-laksh/brew_sudo,toonetown/homebrew,alyssais/brew,gregory-nisbet/brew,tonyg/homebrew,zmwangx/brew,toonetown/homebrew,konqui/brew,palxex/brew,vitorgalvao/brew,reitermarkus/brew,gordonmcshane/homebrew,Linuxbrew/brew,mahori/brew,maxim-belkin/brew,rwhogg/brew,pseudocody/brew,DomT4/brew,MikeMcQuaid/brew,Linuxbrew/brew,EricFromCanada/brew,EricFromCanada/brew,zmwangx/brew,EricFromCanada/brew,MikeMcQuaid/brew,muellermartin/dist,mgrimes/brew,claui/brew,palxex/brew,hanxue/linuxbrew,Homebrew/brew,gordonmcshane/homebrew,JCount/brew,claui/brew,rwhogg/brew,ilovezfs/brew,reelsense/brew,mistydemeo/homebrew,tonyg/homebrew,rwhogg/brew,reitermarkus/brew,amar-laksh/brew_sudo,aw1621107/brew,hanxue/linuxbrew,sjackman/homebrew,vitorgalvao/brew,nandub/brew,JCount/brew,Linuxbrew/brew,Linuxbrew/brew,JCount/brew,sjackman/homebrew,pseudocody/brew,Homebrew/brew,alyssais/brew,reitermarkus/brew,tonyg/homebrew,MikeMcQuaid/brew,mistydemeo/homebrew,nandub/brew,nandub/brew,jmsundar/brew,mgrimes/brew,konqui/brew,EricFromCanada/brew