Small fix in test script timestamp generator.
Small fix in test script timestamp generator.

markwal/CuraEngine,markwal/CuraEngine,Ultimaker/CuraEngine,pratikshashroff/pcura,totalretribution/CuraEngine,alephobjects/CuraEngine,alephobjects/CuraEngine,totalretribution/CuraEngine,ROBO3D/CuraEngine,totalretribution/CuraEngine,alephobjects/CuraEngine,pratikshashroff/pcura,pratikshashroff/pcura,markwal/CuraEngine,Ultimaker/CuraEngine,ROBO3D/CuraEngine,ROBO3D/CuraEngine