Fix: Hide empty categories in categories block. (#13549)

This commit uses hide_empty option during categories request to make sure categories that have no posts are not displayed in the categories block edit view. On the frontend, they are not rendered so the edit view should replicate that.

Some categories may still show zero as a count. That happens because these categories have descendant categories with posts associated to them.

packages/block-library/src/categories/edit.js

@@ -201,7 +201,7 @@ export default compose(
 	withSelect( ( select ) => {
 		const { getEntityRecords } = select( 'core' );
 		const { isResolving } = select( 'core/data' );
-		const query = { per_page: -1 };
+		const query = { per_page: -1, hide_empty: true };
 
 		return {
 			categories: getEntityRecords( 'taxonomy', 'category', query ),