Ask to keep data when uninstalling

[BrayanDSO]

https://developer.android.com/guide/topics/manifest/application-element#fragileuserdata

Pull Request template

Purpose / Description

After scoped storage it is better to warn the user before uninstalling to avoid losing their collection

Approach

Add the corresponding tag to the manifest
https://developer.android.com/guide/topics/manifest/application-element#fragileuserdata

How Has This Been Tested?

On my phone, Android 13:

• Tried to uninstall the app and see if the message to keep data appears

Learning (optional, can help others)

https://developer.android.com/guide/topics/manifest/application-element#fragileuserdata

Checklist

Please, go through these checks before submitting the PR.

• You have a descriptive commit message with a short title (first line, max 50 chars).
• You have commented your code, particularly in hard-to-understand areas
• You have performed a self-review of your own code
• UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• UI Changes: You have tested your change using the Google Accessibility Scanner

[david-allison]

Optional: screenshot would be useful for posterity

[lukstbit]

Nice, didn't know about that option!