Update dynamic settings lti keys entry
Update dynamic settings lti keys entry

Test Plan:
Using docker canvas verify you can hit the
/api/lti/security/jwks endpoint and see three JWKs

Change-Id: I687cec8012f4ebfd1d9319e65b52343e6bae89bb
Reviewed-on: https://gerrit.instructure.com/188823
Tested-by: Jenkins
QA-Review: Marc Phillips <b810f855174e0bc032432310b0808df2cf714fbc@instructure.com>
Product-Review: Weston Dransfield <e9203059795dc94e28a8831c65eb7869e818825e@instructure.com>
Reviewed-by: Marc Phillips <b810f855174e0bc032432310b0808df2cf714fbc@instructure.com>

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