Fix initialization of depletion reaction xs
Fix initialization of depletion reaction xs

shikhar413/openmc,smharper/openmc,wbinventor/openmc,smharper/openmc,wbinventor/openmc,shikhar413/openmc,liangjg/openmc,amandalund/openmc,walshjon/openmc,walshjon/openmc,amandalund/openmc,liangjg/openmc,liangjg/openmc,paulromano/openmc,wbinventor/openmc,paulromano/openmc,paulromano/openmc,mit-crpg/openmc,johnnyliu27/openmc,paulromano/openmc,mit-crpg/openmc,wbinventor/openmc,amandalund/openmc,mit-crpg/openmc,liangjg/openmc,walshjon/openmc,walshjon/openmc,shikhar413/openmc,amandalund/openmc,shikhar413/openmc,johnnyliu27/openmc,johnnyliu27/openmc,smharper/openmc,smharper/openmc,mit-crpg/openmc,johnnyliu27/openmc