Recent form simplifications have introduced changes to fieldset identifiers which has broken (possibly among other things) the all/none links on backup/import pages. The fieldset identifiers are now modified with a preceeding 'id_' being added to fieldset ids (why?). The JavaScript that attempts to identify of the all/none links should be added relies on the fieldset identifier.

Replication steps:
This requires a site with at least two courses, one with activities resources

1. Log in as admin/teacher
2. Navigate to one of the courses
3. Click Import
4. Select another course with activities/resources
5. Click continue
6. Click next on the initial settings page
7. Check above the course sections

Expected outcome: You should see all/none links

Actual outcome: The all/none links are missing