fixed indentation bug in dm2_download_megatest.py
fixed indentation bug in dm2_download_megatest.py

ctb/pygr,ctb/pygr,GenDataPro/pygr,GenDataPro/pygr,cjlee112/pygr,cjlee112/pygr,ctb/pygr,GenDataPro/pygr,ctb/pygr,ctb/pygr,cjlee112/pygr,RitwikGupta/pygr,theoryno3/pygr,cjlee112/pygr,theoryno3/pygr,theoryno3/pygr,RitwikGupta/pygr,RitwikGupta/pygr