Fix NotesController in EE failing since 16fe447d

What does this MR do?

Looks like normalize_create_params for Groups::Epics::NotesController is now overridden by https://gitlab.com/gitlab-org/gitlab-ee/commit/16fe447de075c972f6b527e0cdbdb5c1ea725062#e09b2ee7aa552d9c74db7a7905c7e626eff5a7cb_213_206 since 16fe447d. Convert the code block so that the override in Groups::Epics::NotesController works with NotesActions

What are the relevant issue numbers?

Fixes https://gitlab.com/gitlab-org/gitlab-ee/issues/9934 and https://gitlab.com/gitlab-org/gitlab-ee/issues/9935

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated via this MR
• [-] Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• [-] Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• [-] Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• EE specific content should be in the top level /ee folder
• [-] For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?
• Security reports checked/validated by reviewer