[editor] Fix radio-group duplication

#283

projects/common/models/elements/input-elements/radio-button-group.ts

 import { Type } from '@angular/core';
 import { ElementFactory } from 'common/util/element.factory';
-import { BasicStyles, InputElement, PositionedUIElement, PositionProperties } from 'common/models/elements/element';
+import {
+  BasicStyles, InputElement, PositionedUIElement, PositionProperties
+} from 'common/models/elements/element';
 import { ElementComponent } from 'common/directives/element-component.directive';
 import { RadioButtonGroupComponent } from 'common/components/input-elements/radio-button-group.component';
 
@@ -15,7 +17,7 @@ export class RadioButtonGroupElement extends InputElement implements PositionedU
 
   constructor(element: Partial<RadioButtonGroupElement>, ...args: unknown[]) {
     super({ height: 100, ...element }, ...args);
-    if (element.richTextOptions) this.richTextOptions = element.richTextOptions;
+    if (element.richTextOptions) this.richTextOptions = [...element.richTextOptions];
     if (element.alignment) this.alignment = element.alignment;
     if (element.strikeOtherOptions) this.strikeOtherOptions = element.strikeOtherOptions;
     this.position = ElementFactory.initPositionProps({ marginBottom: 30, ...element.position });