Fix permissions migration when AllowEditPost is set to "Always"

Description

Case missed during the initial permissions migration in v4.9:

If "AllowEditPost" config is set to "always" before the upgrade, then during the upgrade migration we should set the config "PostEditTimeLimit" to "-1" regardless of it's current value.

Discussion thread: https://pre-release.mattermost.com/core/pl/stzrinqkbpb5zbh15ht55cyb1c

QA Test Steps

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Mana

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Assignee

George Goldberg

QA Assignee

Linda Mitchell

Reporter

Eric Sethna

Epic Link

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Fix versions

Mattermost Team

Platform

Sprint

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GitHub Issue

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