fix: show custom permissions when share is removed from edit bundle

[kristian-zendato]

• Resolves: https://github.com/nextcloud-gmbh/server/issues/1031

Summary

• Fix permission bundle matching so it compares the full permissions bitmask against the configured edit bundle.
• After refresh, shares with edit rights but without resharing now show Custom permissions instead of Can edit

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI