After fedup F23 -> F24 no more left-handed mouse

[Mark]

Hi

I just upgraded my desktop from F23 to F24 via fedup and after that the
setting to have the right mouse button as the primary one has no
effect. That is I go to All Settings -> Mouse & Touchpad and select
Right as the primary button. But it has no effect at all. Even when I
go to Test Your Settings it still reports that the right button is the
secondary one.

Is there some config file that I could tweak to set this?