fixed toc drag and drop on description template type editor

dmp-frontend/src/app/ui/admin/description-template/description-template.module.ts

@@ -32,6 +32,7 @@ import { ImportDescriptionTemplateDialogComponent } from './listing/import-descr
 import { DescriptionTemplateEditorReferenceTypeFieldComponent } from './editor/components/field-type/reference-type/description-template-editor-reference-type-field.component';
 import { DescriptionFormModule } from '@app/ui/description/editor/description-form/description-form.module';
 import { FinalPreviewComponent } from './editor/components/final-preview/final-preview.component';
+import { DragulaModule } from 'ng2-dragula';
 
 @NgModule({
 	imports: [
@@ -47,8 +48,8 @@ import { FinalPreviewComponent } from './editor/components/final-preview/final-p
 		UserSettingsModule,
 		CommonFormattingModule,
 		RichTextEditorModule,
-
-		DescriptionFormModule
+		DescriptionFormModule,
+		DragulaModule.forRoot(),
 	],
 	declarations: [
 		DescriptionTemplateEditorComponent,