Reverted changes to test_mgxs_library_ce_to_mg.py.
Reverted changes to test_mgxs_library_ce_to_mg.py.

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