Python: change test expectations

an extra node is now in play.

Author: yoff

python/ql/test/experimental/dataflow/basic/callGraphSources.expected

@@ -1,2 +1,3 @@
 | test.py:4:10:4:10 | ControlFlowNode for z |
+| test.py:7:5:7:17 | ControlFlowNode for obfuscated_id |
 | test.py:7:19:7:19 | ControlFlowNode for a |

python/ql/test/experimental/dataflow/basic/test.py

@@ -4,4 +4,4 @@ def obfuscated_id(x): #$ step="FunctionExpr -> obfuscated_id"
   return z #$ flow="42, l:+2 -> z" step="z, l:-1 -> z"
 
 a = 42 #$ step="42 -> a"
-b = obfuscated_id(a) #$ flow="42, l:-1 -> b" flow="FunctionExpr, l:-6 -> obfuscated_id" step="obfuscated_id(..) -> b" step="obfuscated_id, l:-6 -> obfuscated_id" step="a, l:-1 -> a"
+b = obfuscated_id(a) #$ flow="42, l:-1 -> b" step="obfuscated_id(..) -> b" step="obfuscated_id, l:-6 -> obfuscated_id" step="a, l:-1 -> a"