reverted simple lattice settings.xml to version in develop
reverted simple lattice settings.xml to version in develop

walshjon/openmc,amandalund/openmc,johnnyliu27/openmc,walshjon/openmc,shikhar413/openmc,liangjg/openmc,wbinventor/openmc,mit-crpg/openmc,kellyrowland/openmc,paulromano/openmc,smharper/openmc,johnnyliu27/openmc,amandalund/openmc,liangjg/openmc,johnnyliu27/openmc,mit-crpg/openmc,mjlong/openmc,mit-crpg/openmc,amandalund/openmc,paulromano/openmc,smharper/openmc,wbinventor/openmc,walshjon/openmc,shikhar413/openmc,liangjg/openmc,johnnyliu27/openmc,walshjon/openmc,paulromano/openmc,shikhar413/openmc,smharper/openmc,samuelshaner/openmc,wbinventor/openmc,mit-crpg/openmc,samuelshaner/openmc,amandalund/openmc,bhermanmit/openmc,mjlong/openmc,wbinventor/openmc,liangjg/openmc,kellyrowland/openmc,samuelshaner/openmc,smharper/openmc,samuelshaner/openmc,paulromano/openmc,bhermanmit/openmc,shikhar413/openmc