[editor] Fix unregistering of deleted Likert rows

projects/editor/src/app/components/properties-panel/model-properties-tab/input-groups/options-field-set.component.ts

@@ -188,6 +188,7 @@ export class OptionsFieldSetComponent {
 
   removeLikertRow(index: number): void {
     const valueList = this.combinedProperties.rows as LikertRowElement[];
+    valueList[index].unregisterIDs();
     valueList.splice(index, 1);
     this.updateModel.emit({ property: 'rows', value: valueList });
   }