[fix/disable-resharing] Disable re-sharing for items in Shares Jail

[felix-schwarz]

Description

This PR implements #1353.

Related Issue

#1353

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

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[jesmrec]

Shared with me items don't have the option Sharing available anymore. Done.