Simple Grade Entry: Switch to server-side pagination

[benjaminvialle]

Since the Submissions table has been modified to use server-side pagination, we should probably switch to server-side pagination for the Grades table for GradeEntryForms as well.

See this review request for server-side pagination for the Submissions table.

[mike-stewart]

Is this change still needed? See pull request #928 for the current pagination of the grade entry table.

[benjaminvialle]

Yes, I think I can close this issue.

Thank you