Change in build 167489 rejected

A change in [build 167489](https://buildbot.flathub.org/#/builders/6/builds/184263) has been reviewed by the Flathub team (@flathub/build-moderation), and rejected for the following reason:

> Please explain why elevating to home is needed as https://github.com/flathub/com.diy_fever.DIYLayoutCreator/pull/25 has no information. Additionally the various xdg-* filesystem permissions are redundant with home.
## Changes
| Field | Old value | New value |
| --- | --- | --- |
| filesystems | ['xdg-documents', 'xdg-download', 'xdg-pictures'] | ['home', 'xdg-documents', 'xdg-download', 'xdg-pictures'] |

Start with build 167489 and the referenced pull request 25, then inspect the manifest entry that changes filesystem permissions. Done means the manifest explains any need for home access and removes the redundant xdg-documents, xdg-download, and xdg-pictures permissions, allowing the change to pass review.

Written by the indexing model from the issue text.