Removed uneccesary hex_lattice assignments
Removed uneccesary hex_lattice assignments

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