Fix name confusion in PrKalmanFilterTool LHCbID finding

Andre Guntherrequested to merge
gunther_fixIDfinding into master

There is some confusing naming when finding the hits with a specific LHCbID in the PrKalmanFilterTool. This is fixed by explicitly naming the variable that holds the LHCbID lhcbid 😄

No side effects expected.

/cc @pherrero

Edited by Andre Gunther

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