Fix issue 2119: make live photo identifier more generic

[samcodefish]

Motivation

Issue 2119

We are running into the problem outlined in issue 2119 where there is a "Could not find image file..." error on iOS when selecting images that are on iCloud but not yet fully synced to the user's device.

I found by updating the live photo identifier to be more generic (rather than it explicitly being "public.jpeg") this resolved the issue.

Please note: I am a React Native / Javascript developer, and not by any means a native iOS / Objective C developer. To reach the solution in this PR I referenced the code in this PR, and added the least amount I could to resolve the issue. Someone with more native iOS experience may be able to suggest a more robust solution to the issue.

Test Plan

(Requires testing with two devices logged into the same iCloud account)

• Take a photo on device A
• Use the example app on device B logged into the same iCloud account
• Select the image synced over with iCloud (without making any edits)
• Without this change you'll get the "Could not find image file..." warning. With this change, you'll retrieve the image as expected.

[efstathiosntonas]

Hi folks, any updates on this one?