Desktop: Clicking on image in external image preview opens the image within the app

Description

Reproed on community-release, but not mysql.test running the 4.3.1 desktop app on Mac. This seems to only happen on servers using an image proxy (or possibly certain image proxies).

Repro steps:
1) Post an external image link such as

2) Click on the image to open the View Image modal
3) Click on the image in the modal

Observed: On a server with an image proxy, the image opens within the app. Otherwise, the image opens in the browser
Expected: The image always opens in the browser

QA Test Steps

See description

Mana

2

Assignee

Harrison Healey

QA Assignee

Jelena Gilliam

Reporter

Harrison Healey

Epic Link

None

Fix versions

Mattermost Team

Apps

Sprint

None

Labels

None

QA Testing Areas

Other (write in QA test steps)

GitHub Issue

None

Components

None

Severity

S3_minor_issue
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