Python: Fix a type-tracking test

Author: RasmusWL

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

@@ -135,7 +135,7 @@ def meth3(self):
     def track_self(self): # $ tracked_self
         self.meth1() # $ tracked_self
         super().meth2()
-        super(Bar, self).foo3() # $ tracked_self
+        super(Bar, self).meth3() # $ tracked_self
 
 # ------------------------------------------------------------------------------
 # Tracking of attribute lookup after "long" import chain