Move todo query to the slave
Move todo query to the slave

fixes:KNO-378
flag=none

Test plan
- Set up a slave user in Canvas
  https://bit.ly/39GNe1q
- Ensure you can access the todo
  list as a teacher on both the
  main dashboard as well as
  the one in a course

Change-Id: Ida66c2a4a29602a492ec249b180371d88438fa4b
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/232601
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>
QA-Review: Davis Hyer <60fbffed049dcae9186e63e354cbc0b825bf5523@instructure.com>
Product-Review: Brian Watson <4411c2aac809443ec63e2dd517de0f2dbc7408c6@instructure.com>

sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,djbender/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms