Fix typo to make cmfd_on private
Fix typo to make cmfd_on private

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