Fix: _scanModFile() takes exactly 3 arguments (2 given)

MERGE/SCAN ERROR: Oblivion.esm
Traceback (most recent call last):
  File "bash\basher.py", line 7067, in Execute
    patchFile.scanLoadMods(SubProgress(progress,0.2,0.8)) #try to speed this up!
  File "bash\bosh.py", line 10502, in scanLoadMods
    patcher.scanModFile(modFile,nullProgress)
TypeError: _scanModFile() takes exactly 3 arguments (2 given)