Remove diffusion score from statepoint.py.
Remove diffusion score from statepoint.py.

smharper/openmc,paulromano/openmc,bhermanmit/cdash,paulromano/openmc,walshjon/openmc,smharper/openmc,liangjg/openmc,mjlong/openmc,samuelshaner/openmc,sxds/opemmc,shikhar413/openmc,paulromano/openmc,lilulu/openmc,shikhar413/openmc,shikhar413/openmc,liangjg/openmc,johnnyliu27/openmc,sxds/opemmc,samuelshaner/openmc,wbinventor/openmc,mjlong/openmc,samuelshaner/openmc,wbinventor/openmc,kellyrowland/openmc,smharper/openmc,walshjon/openmc,amandalund/openmc,johnnyliu27/openmc,shikhar413/openmc,wbinventor/openmc,samuelshaner/openmc,liangjg/openmc,smharper/openmc,lilulu/openmc,walshjon/openmc,amandalund/openmc,bhermanmit/openmc,mit-crpg/openmc,bhermanmit/openmc,nhorelik/openmc,amandalund/openmc,mit-crpg/openmc,lilulu/openmc,shenqicang/openmc,kellyrowland/openmc,keadyk/openmc_mg_prepush,paulromano/openmc,nhorelik/openmc,shenqicang/openmc,johnnyliu27/openmc,liangjg/openmc,amandalund/openmc,keadyk/openmc_mg_prepush,johnnyliu27/openmc,mit-crpg/openmc,keadyk/openmc_mg_prepush,wbinventor/openmc,walshjon/openmc,mit-crpg/openmc