Fixed run_scapy.bat to work under Python 2.6

The old batch file worked on Python 2.5 but lead to the
following error under Python 2.6:
c:\Python26\python.exe: scapy is a package and cannot be directly executed
New file should work under both versions.
diff --git a/run_scapy.bat b/run_scapy.bat
index 6c7cf92..ba19aa5 100644
--- a/run_scapy.bat
+++ b/run_scapy.bat
@@ -1,3 +1,3 @@
 @echo off

 set PYTHONPATH=%cd% 

-python -m scapy

+python -m scapy.__init__