Update LuaTeX testfiles for ^@ change
tree123c4a45f94a5d4517ceacaf4350f8fdc8008d21
drwxr-xr-x - latex2e-20150101
drwxr-xr-x - latex2e-20151001
drwxr-xr-x - latex2e-20160201
drwxr-xr-x - latex2e-20160331
drwxr-xr-x - latex2e-20170101
drwxr-xr-x - trunk