allow non-delayed posts to become delayed fixes #4446
allow non-delayed posts to become delayed fixes #4446

Change-Id: Ifd86d4a06651dd632955223acc58e393d4dc7fa9
Reviewed-on: https://gerrit.instructure.com/3425
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>

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