setTransitionNextTransition uses incorrect enum

[Jorgosw]

For the existing source it is impossible to set nextTransition to value 6 which is correct, because the value is validated with wrong enum:
nextTransition_val = self.atem.transitionStyles[nextTransition].value
in my case i have fixed in following way:
nextTransition_val = nextTransition
which allows me to set any transition setting i need.