Fix fatal error for Post_Meta hook return type#39

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r-a-y wants to merge 2 commits intohumanmade:v2.0from

hwdsb:fix/remove-schedule-void

Commits on Oct 9, 2020

Fix fatal error for Post_Meta\remove_schedule() return type.
r-a-y
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Commits on Mar 9, 2021

Fix fatal error for Post_Meta\update_schedule() return type.
r-a-y
committed