Updated test data to match Typeshed defitions

We'll revert it as soon as https://github.com/python/typeshed/pull/876
is merged.

python/testData/intentions/convertLambdaToFunction2_after.py

@@ -1,5 +1,5 @@
 def transform():
-  def function(x):
+  def function1(x):
       return x + 5
 
-  return function
+  return function1