Doesn't matter.
That's why they supposedly play the SB at a "neutral site". They don't play the AFC or NFC Champ. game at an "afore designated" site. Those home games are earned and rightfully so. If it happens someday that a team who makes it to the SB gets to play in their actual stadium (closest town doesn't count), that's just a roll of the dice that to THIS day, hasn't happened. The next best shot at it happening is when Dallas gets the SB in a few years.
AND................if I hear another thing about the "curse" of the blue jersey, I'm gonna puke. Do a "Google" about Dallas in their dark jerseys, and you'll find they're WAY above .500. Not as good as the whites, but comparable and close.
"Curses" are for Eggless and Lions and Cardinals and Bills. A team with 5 SB rings has no curse. The Cubbies have a "curse". The Dallas Cowboys, God's Team, does not have a curse.
Dallas has home field throughout the playoffs, and that INCLUDES the SB @ Arizona. THAT'S a HOME game for Dallas, jersey or no jersey.