Use correct Boron fractions of Polyboron in passive materials

Merged Nicolas Koehler requested to merge nkoehler/athena:passiveMatPolyboron into master


this MR changes the passive material descriptions of the best knowledge Run2 layout and the Run3/4 layouts to use the correct Boron fractions of Polyboron. A mismatch was found in radiation studies.

CC @menke, @huu

Best, Nico

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