Python: Update test expectations

Author: yoff

python/ql/test/experimental/dataflow/tainttracking/basic/LocalTaintStep.expected

@@ -1,5 +1,3 @@
-| test.py:0:0:0:0 | SSA variable $ | test.py:0:0:0:0 | Exit node for Module test |
 | test.py:7:5:7:16 | SSA variable also_tainted | test.py:8:5:8:22 | SSA variable also_tainted |
 | test.py:7:5:7:16 | SSA variable also_tainted | test.py:8:10:8:21 | ControlFlowNode for also_tainted |
 | test.py:7:20:7:25 | ControlFlowNode for SOURCE | test.py:7:5:7:16 | SSA variable also_tainted |
-| test.py:8:5:8:22 | SSA variable also_tainted | test.py:6:1:6:11 | Exit node for Function func |