put rescue_from statements in proper order
put rescue_from statements in proper order

closes FOO-1277
flag=none

TEST PLAN:
  1) request a bad format for a route like /courses/1.mp4
  2) that's a missing template error, which should get handled
     without a sentry report or error report

Change-Id: I0dc0ca44c275481da97d24c95a5a7e986eec91c0
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/254497
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>
Product-Review: Ethan Vizitei <73eeb0b2f65d05a906adf3b21ee1f9f5a2aa3c1c@instructure.com>

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