Python: Delete duplicated tests

All the same tests are present in `fieldflow/test.py`

python/ql/test/experimental/dataflow/fieldflow/examples.py

@@ -1,59 +0,0 @@
-from python.ql.test.experimental.dataflow.testDefinitions import *
-
-# Preamble
-
-
-class MyObj(object):
-    def __init__(self, foo):
-        self.foo = foo
-
-
-class NestedObj(object):
-    def __init__(self):
-        self.obj = MyObj("OK")
-
-    def getObj(self):
-        return self.obj
-
-
-# Example 1
-def setFoo(obj, x):
-    SINK_F(obj.foo)
-    obj.foo = x
-
-
-myobj = MyObj("OK")
-
-setFoo(myobj, SOURCE)
-SINK(myobj.foo)
-
-# Example 2
-x = SOURCE
-
-a = NestedObj()
-
-a.obj.foo = x
-
-SINK(a.obj.foo)
-
-# Example 2 with method call
-x = SOURCE
-
-a = NestedObj()
-
-a.getObj().foo = x
-
-SINK(a.obj.foo)  # Flow missing
-
-# Example 3
-obj = MyObj(SOURCE)
-SINK(obj.foo)
-
-# Local flow
-def fields_with_local_flow(x):
-    obj = MyObj(x)
-    a = obj.foo
-    return a
-
-
-SINK(fields_with_local_flow(SOURCE))