Bridge VBScript exit code to the caller on the Batch wrapper
Bridge VBScript exit code to the caller on the Batch wrapper

If the Windows VBScript scanning script exits with a code other than 0,
the client that calls `win32.bat` will incorrectly think the script
finished successfully given that the Batch wrapper is not passing the
VBScript exit code to the caller.

See: https://github.com/resin-io/etcher/issues/1126
Signed-off-by: Juan Cruz Viotti <4148f5869aa1bcd7efd85b513a5874967e585032@openmailbox.org>

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