Puts use_of_apply example back into expressions_test to avoid messing up other tests

python/ql/test/2/query-tests/Expressions/UseofApply.expected

@@ -1 +1,2 @@
 | UseofApply.py:19:3:19:17 | ControlFlowNode for apply() | Call to the obsolete builtin function 'apply'. |
+| expressions_test.py:3:5:3:21 | ControlFlowNode for apply() | Call to the obsolete builtin function 'apply'. |

python/ql/test/2/query-tests/Expressions/expressions_test.py

@@ -1,3 +1,7 @@
+
+def use_of_apply(func, args):
+    apply(func, args)
+
 def use_of_input():
     return input()