Classifieds Fixed Category listing count is not updated when listing is marked as sold / unsold

[Kirby]

When a listing is manually marked as sold /unsold, fastUpdate is called on the entity - this does not trigger updateCategoryRecord via _postSave

This causes the category listing counter to get skewed and only rebuilding listing categoreis seems to fix this.

Suggested Fix
Call save instead of fastUpdate and modify updateCategoryRecord to react to listing_status changes