DynamicRoot: Restricted the doctype picker to non-element-types

src/Umbraco.Web.UI.Client/src/packages/dynamic-root/modals/dynamic-root-query-step-picker-modal.element.ts

@@ -35,6 +35,7 @@ export class UmbDynamicRootQueryStepPickerModalModalElement extends UmbModalBase
 		this.#documentTypePickerContext
 			.openPicker({
 				hideTreeRoot: true,
+				pickableFilter: (x) => x.isElement === false,
 			})
 			.then(() => {
 				const selectedItems = this.#documentTypePickerContext.getSelection();