fix term filter label on admin courses page
fix term filter label on admin courses page

fixes CNVS-33490

test plan:
- ensure that there are multiple terms created
- visit the courses admin page
- note that the "Show courses from term" dropdown has an a11y label

Change-Id: Icb2fa269a3c93e5c4c59439324e9539c570056d3
Reviewed-on: https://gerrit.instructure.com/95937
Tested-by: Jenkins
Reviewed-by: Dan Minkevitch <2591e5f46f28d303f9dc027d475a5c60d8dea17a@instructure.com>
QA-Review: David Tan <6283e310a2278fc51bdc4fb5974f70dd9c3366b9@instructure.com>
Product-Review: Felix Milea-Ciobanu <9384aa226ac9d3237ed0bc52e18ffcb251ee0bf7@instructure.com>

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