Include shared library of non owner users

[timvahlbrock]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/steilerDev/icloud-photos-sync/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

If the user isn't the owner of the shared zone, photos in the shared zone aren't discovered.

Issue Number: #598

What is the new behavior?

Photos in the shared zone are discovered, regardless of wether the user is owner of the shared zone or not.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[timvahlbrock]

hey @steilerDev, I totally understand that you're probably still busy and wouldn't have time for a review of this PR or the other one. Could you still enable checks on this PR so I can get it into a state where it is ready to review once you have time for it?

[steilerDev]

@timvahlbrock can you update your PR so I can get it bundled in the next release?

[timvahlbrock]

FYI: I think I haven't written any tests to test the bug/new functionality yet.