Grader report pagination error when using Boost

As spotted by khushbu.verma in MDLQA-11807:

Steps to reproduce on site using the Boost theme:

1. Log in as admin or teacher and go to a grader report which has pagination (i.e. the number of course enrolments is greater than grade_report_studentsperpage in the Site administration) e.g. https://qa.moodle.net/grade/report/grader/index.php?id=7
2. Turn editing on and manually enter a grade anywhere, then save changes
3. In the pagination controls, click the link for the page you are on.

Expected result:

The page you are on should not be a link. It's not a link when using Clean, only when using Boost.

Actual result:

An error message is displayed:

A required parameter (id) was missing

×Debug info:
Error code: missingparam
×Stack trace:
line 482 of /lib/setuplib.php: moodle_exception thrown
line 573 of /lib/moodlelib.php: call to print_error()
line 31 of /grade/report/grader/index.php: call to required_param()