Completed courses should be shown under "My courses" also in Nav drawer.

Completed courses should be shown under "My courses" also in Nav drawer, as they are listed in Navigation block.

This happens when using Boost-based themes.

Reproduction steps:

1. Turn on completion in a course
2. Set up a few activities with activity completion
3. Log in as a student and complete all the activities

Expected result:

• The course remains in My courses so the student can see their results and work towards exams, etc.

Actual result:

• The course disappears as it is judged to be no longer current.