add radius as input parameter for EventShape tool initialization

This MR fixes a small issue that was observed when initializing the event shape tool using large-R jets. Right now the jet radius of that specific jet definition is automatically used however we want to R = 0.4 jets independent of the jet definition to define this event-level variable. The radius can be set now if another value than 0.4 is desired.

This should hopefully fix the issues observed by the jet trigger group for large-radius jets reported in ATR-24028

Tagging @wbalunas @sawyer @delsart @valentem @ayana @mswiatlo for their information.