focus jump to today on first due date

fixes CNVS-12968

If you have multiple assignments in a syllabus that have the same
due date and you click on "Jump to Today" it focuses you on the last
item in the list. This fix makes it focus you on the first item in the
list.

--- Test Plan ---
As a user
Given I have multiple assignments that are on the same day and that day
is today
And I'm on the syllabus page
When I click on the "Jump to Today" link
Then I should be scrolled down to the assignments for that day
And I should be focused on the first assignment for that day

Change-Id: I514de278ed77567168e2b42c0cda96e673ba284e
Reviewed-on: https://gerrit.instructure.com/35994
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Bracken Mosbacker <bracken@instructure.com>