block_recentlyaccesscourses: Use / add admin setting to control the output of the course category

In MDL-64855, there was an admin setting "block_myoverview | displaycategories" to control the output of the course category in block_myoverview. An admin has the possibility to disable the category in block_myoverview and only show the course name.

However, block_recentlyaccesscourses also shows the category and this output is not controlled by "block_myoverview | displaycategories".

It should be fair to assume that if an admin disabled the output of the category in block_myoverview, he also would want not to see it in block_recentlyaccesscourses.

There are two approachs to solve this:
1. Create a settings page for block_recentlyaccesscourses and a setting "block_recentlyaccesscourses | displaycategories" which let's admins disable the category. This seems to be an overhead, but it's straightforward.
2. Change block_recentlyaccesscourses to also respect the setting "block_myoverview | displaycategories". This can be realized quickly, but does not respect the independence of Moodle plugins.