Correct binning when creating interpolated BField map (was ACTS-430)

Original author Julia Hrdinka @jhrdinka

The maximum was set wrongly in the helper methods when creating the interpolated bfield map.

Since per definition of the Acts::grid the values always belong to the left bin boundary, one extra bin needs to be added in order to include the maximum.

Edited Mar 27, 2019 by Moritz Kiehn

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