Remove dependence of inelastic_scatter on particle.
Remove dependence of inelastic_scatter on particle.

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