Remove the option to share bookmarks for user files.

[SergioEstevao]

| 📘 Part of: # |
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Fixes #

This PR removes the option to share bookmarks that are for user files. Those files are private to the user so it does not make sense to share a link to file other users cannot open.

To test

1. Start the app
2. Open the Profile tab
3. Tap on Files
4. Tap on one of the files
5. Tap on bookmark
6. Select one of the bookmarks
7. Check that no share option is show

Checklist

• I have considered if this change warrants user-facing release notes and have added them to CHANGELOG.md if necessary.
• I have considered adding unit tests for my changes.
• I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

[dangermattic]

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