Vanilla switch vehicle bindings are also used in landscape painting mode

[MicaelJarniac]

VeEx adds its own vehicle switch bindings, and it even suggests unbinding the vanilla vehicle switch bindings that the game uses.

One problem I've had with that is that those same bindings are also used for switching settings in the landscape painting mode. So if the user unbinds the vanilla vehicle switch keys, and binds VeEx keys instead, switching between the settings in landscape painting mode won't be possible.

I've worked around this by binding the vanilla vehicle switch to + and -, and then using Tab for VeEx. That way I can switch vehicles using my custom order in VeEx with Tab, and switch settings in landscape painting with + and -.