Python: Slight rewrite of numpy test

To use positional argument for allow_pickle

Author: RasmusWL

python/ql/test/library-tests/frameworks/numpy/Decoding.py

@@ -2,5 +2,5 @@
 
 numpy.load(file_)  # $ decodeInput=file_ decodeOutput=numpy.load(..) decodeFormat=numpy
 numpy.load(filename=file_)  # $ decodeInput=file_ decodeOutput=numpy.load(..) decodeFormat=numpy
-numpy.load(file_, allow_pickle=True)  # $ decodeInput=file_ decodeOutput=numpy.load(..) decodeFormat=numpy decodeMayExecuteInput
-numpy.load(filename=file_, allow_pickle=True)  # $ decodeInput=file_ decodeOutput=numpy.load(..) decodeFormat=numpy decodeMayExecuteInput
+numpy.load(file_, allow_pickle=True)  # $ decodeInput=file_ decodeOutput=numpy.load(..) decodeFormat=numpy decodeFormat=pickle decodeMayExecuteInput
+numpy.load(file_, None, True)  # $ decodeInput=file_ decodeOutput=numpy.load(..) decodeFormat=numpy decodeFormat=pickle decodeMayExecuteInput