Python: Fix syntax error in with test output

Depends on an internal PR. The two lines in question were caused by
the insertion of an extra node due to the failure to parse a trailing
comma corrcetly.

Author: tausbn

python/ql/test/3/library-tests/with/test.expected

@@ -11,6 +11,4 @@
 | test.py:4:5:4:17 | CtxManager3() |
 | test.py:4:5:4:29 | With |
 | test.py:4:22:4:29 | example3 |
-| test.py:4:31:4:30 |  |
-| test.py:4:31:4:30 | With |
 | test.py:6:5:6:8 | Pass |