Fix spacing around % as pointed out by @wbinventor
Fix spacing around % as pointed out by @wbinventor

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