DefaultEngine.ini ignored in packaged build?

I added a couple lines to my project’s DefaultEngine.ini and changed the line in UE4’s BaseEngine.ini. Works in the editor, but doesn’t work in a packaged build. Any suggestions on fixing this?

(I changed it from MaintainXFOV to MaintainYFOV)

[/Script/Engine.LocalPlayer]
AspectRatioAxisConstraint=AspectRatio_MaintainYFOV