Asterix passed as parameter to python extension scripts on Windows

[hugbug]

When executing extension scripts on Windows NZBGet finds an associated interpreter (python.exe in a case of python scripts) in registry. The registry entry looks like this:

Computer\HKEY_CLASSES_ROOT\Python.File\shell\open\command
"C:\Python27\python.exe" "%1" %*

NZBGet replaces %1 with the path to extension script. Here %* is supposed to expand to parameters passed to the script. NZBGet passes everything via environment variables and doesn't use command line parameters. However there is a bug that the asterix isn't removed and passed to the script as parameter.

That's not a a big issue because NZBGet scripts don't expect any parameters and usually do not check passed parameters. However for scripts which can be run not only in NZBGet context but also executed directly via command line that extra asterix can be problematic. See caronc/nzb-subliminal#27.

In this issue: remove asterix at the end of command line.