spec: fix flakey ReplyToAddress test
spec: fix flakey ReplyToAddress test

Test Plan:
1. docker-compose run --rm web bundle exec rspec './spec/models/incoming_mail/reply_to_address_spec.rb[1:2:3:2,1:5:2]' --seed 21942 --format documentation fails without this change and passes with this change

refs DE-113

flag = none

Change-Id: Iba1025b39c10e870227181de11772b1fc5ad78aa
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/242043
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Ryan Norton <65299b45178f94900ff304765e8fbf07bd13b331@instructure.com>
QA-Review: Aaron Ogata <11ccf682c06d1508642f943a3962a1c3d00b8e44@instructure.com>
Product-Review: Aaron Ogata <11ccf682c06d1508642f943a3962a1c3d00b8e44@instructure.com>

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