Desktop: Undo hotkey doesn't work in textboxes

Description

Environment: Desktop 4.3.0 RC2/Mac on community-daily

Repro steps:
1) Type something in one of the post textboxes or search textbox
2) Press cmd+z on Mac or ctrl+z on other OSes

Observed: Nothing happens in the textbox. On Mac, the Edit menu turns blue to indicate that the hotkey was triggered
Expected: The previous changes you made to the textbox are undone like on a browser

QA Test Steps

See description

Status

Mana

None

Assignee

Unassigned

QA Assignee

None

Reporter

Harrison Healey

Epic Link

None

Fix versions

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Mattermost Team

Unassigned

Sprint

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Labels

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QA Testing Areas

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GitHub Issue

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