fix(accordion): removing base accordion styles variable (#2643)

Author: brianferry

elements/pf-accordion/BaseAccordion.ts

@@ -30,8 +30,6 @@ export class AccordionCollapseEvent extends ComposedEvent {
 }
 
 export abstract class BaseAccordion extends LitElement {
-  static readonly styles = [];
-
   static isAccordion(target: EventTarget | null): target is BaseAccordion {
     return target instanceof BaseAccordion;
   }

elements/pf-accordion/pf-accordion.ts

@@ -28,7 +28,7 @@ import style from './pf-accordion.css';
  */
 @customElement('pf-accordion')
 export class PfAccordion extends BaseAccordion {
-  static readonly styles = [...BaseAccordion.styles, style];
+  static readonly styles = [style];
 
   /** When true, only one accordion panel may be expanded at a time */
   @property({ reflect: true, type: Boolean }) single = false;