Add type annotation incorrectly includes default values for function types

[mosuem]

Describe the bug
The Add type annotation produces the wrong code for type Function with default values.

To Reproduce
Steps to reproduce the behavior:

1. Create a class ClassName with a constructor with default values, such as String name = "".
2. Call ClassName.new somewhere.
3. Call the Add type annotation quickfix
4. The type will be ClassName Function(String name = ""), which is marked with the default_value_in_function_type error.

Expected behavior
The type should drop the default values.

[DanTup]

This is fixed by dart-lang/sdk@f11bec5. The fix is in the SDK so will show up in an SDK release rather than a Dart-Code extension update.