fixed HexTestCase was showing some lines more than once
fixed HexTestCase was showing some lines more than once

imanmafi/pyNES,ftick/pyNES,MSylvia/pyNES,JohnKossa/pyNES,shekkbuilder/pyNES,bigpete/pyNES,DaTrollMon/pyNES,edwardpark/pyNES,NickDeckerDevs/pyNES,jay-johnson/pyNES,silky/pyNES,kubov/pyNES,arabenjamin/pyNES,BmanisKing/Mine,Gybes/pyNES,stellatigre/pyNES,jmgaya/pyNES,bradparks/pyNES__python_8bit_nes_games_nintendo,shaunstanislaus/pyNES,GrimDerp/pyNES,gutomaia/pyNES,danielserva/pyNES,sperez4mba/pyNES,tekromancr/pyNES,fufufanatic/pyNES,AsSheng/pyNES,kod3r/pyNES,Militree/pyNES