remove duplicate section dropdown
remove duplicate section dropdown

fixes CNVS-22349

Test plan

0. In a course with sections navigate to the gradebook.
1. Confirm that there is a sections dropdown on the right.
2. Confirm there is NOT a sections dropdown on the left.

Change-Id: Ib0419fbf7cfd78be87277b487a9b1080ab22329f
Reviewed-on: https://gerrit.instructure.com/60656
Tested-by: Jenkins
Reviewed-by: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>
QA-Review: Jason Carter <976bfc4bed0555ff96b3266aea18e7b17a9d471c@instructure.com>
Product-Review: Matt Fairbourn <5f353e1c97bb9cc046b9db20beca0b9392f6f1b2@instructure.com>

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