Fix to small change in geometry.cpp to remove diff.
Fix to small change in geometry.cpp to remove diff.

mit-crpg/openmc,walshjon/openmc,wbinventor/openmc,paulromano/openmc,amandalund/openmc,mit-crpg/openmc,smharper/openmc,johnnyliu27/openmc,shikhar413/openmc,mit-crpg/openmc,walshjon/openmc,wbinventor/openmc,shikhar413/openmc,wbinventor/openmc,shikhar413/openmc,amandalund/openmc,walshjon/openmc,paulromano/openmc,smharper/openmc,johnnyliu27/openmc,smharper/openmc,paulromano/openmc,johnnyliu27/openmc,walshjon/openmc,liangjg/openmc,smharper/openmc,shikhar413/openmc,amandalund/openmc,liangjg/openmc,johnnyliu27/openmc,paulromano/openmc,liangjg/openmc,wbinventor/openmc,liangjg/openmc,mit-crpg/openmc,amandalund/openmc