[BUG] delombok option doesn't generate code for @Nonnull

[jamesbroadhead]

Describe the bug
Files with the @nonnull annotation do not get delombokked when run through the delombok tool.
This is a duplicate of #950, which is closed

To Reproduce
Run delombok over a source file using 'NonNull'

Expected behavior
Code should be generated and written to file

Version info (please complete the following information):

• Lombok version
  1.18.20
• Platform (javac or eclipse, and if so, what is the output of javac -version / the version listed in the about... dialog of eclipse.
  linux / jdk-11

Additional context
Add any other context about the problem here.

[Rawi01]

Works for me. There are also a bunch of tests to make sure this works.