block_myoverview: Link on course category name leading to course is misleading (Regression of MDL-63794)

Since MDL-63794, the course category is displayed in addition to the course name in the My Overview block.

Showing the course category field might make sense as additional meta information about the course, but the course category unfortunately is linking to the course and not to the category.

Users clicking on the category name might be confused as they are redirected to the course.

I would like to propose to rethink this link. In my point of view, it would be better to:

• Either set the course category name to really link to the course category
• Remove the link on the course category completely and keep only the course name as a link.

I dare to tag this as a regression of MDL-63794.