Using export with content dependencies includes schema dependencies

[johanbomoller]

When using export on a content item and selecting "include content dependencies" it will also include all schema dependencies event if include schema dependencies is not selected.

Reproduction

Bug summary

The bug makes it hard to export just content with content dependencies.

Steps to reproduce

• Access the backoffice
• Rightclick a content node.
• Select export
• Select Include content dependencies
• Export
• Download the result
• Open the zip
• See how it contains all schema dependencies.

Expected result

A zip file containing only content and content dependencies. No schemas.

Actual result

A zip that contains more schemas than content.