shift enumeration

problem with shift enumeration. /shift/## can bring you shifts from other events

Bsp:

https://turno.immerda.ch/s/XbAKkHxTkR3MlXPxBDqwSEtFBWs6Go2X/shift/10 ->event Pizza kochen

https://turno.immerda.ch/s/XbAKkHxTkR3MlXPxBDqwSEtFBWs6Go2X/shift/11 -> andere event