volume annotation type doesn't update on mri when changed in project setting

[ntraut]

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Current behaviour

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In the project setting page we have the possibility to change a volume annotation type. But when we do this and go back to project page, the MRI still has the old annotation type, because the annotation type for the project is written in the mri entry at the creation of the annotation and not modified after.

Expected behaviour

The MRI annotation should follow the project annotation. It would seem more natural that the project annotation is not stored in the mri entry but in the project entry as it is only specific to the project, and the same mri can be used by multiple projects. At least it should not be possible to update the annotation type for the project if it is not possible to do it for the mri of the project.

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