Fix invalid RCE configuration
Fix invalid RCE configuration

closes CORE-3185

Test Plan:
  - Create a global announcment
  - Try adding another one
  - The RCE should appear when you add the second one

Change-Id: Idaacd111507997179b8f823e725b6630a35348bf
Reviewed-on: https://gerrit.instructure.com/201049
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
QA-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Product-Review: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Tested-by: Gentry Beckmann <f487939f789774cca922ca5b886632de73477ea0@instructure.com>

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