Increase the RCE autosaved content timeout
Increase the RCE autosaved content timeout

it's now 1 day

closes LA-970
flag=rce_auto_save

test plan:
  - start editing something in the rce
  - walk away from your computer for > 1 hour < 1 day
  - return and load up the same page
  > expect to be prompted to restore your previously autosaved content

Change-Id: Idea7406907de314e275679691de44cdcc1a3a7be
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/235679
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Anju Reddy <851202533fb1f0b615e4547ba226c76996d060dd@instructure.com>
Product-Review: Ed Schiebel <0ca8a83847a5889cf05cb219c0ab09f6b646243b@instructure.com>
Reviewed-by: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>

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