Move custom elements upgrade call to core

Author: koddsson

src/controller.ts

@@ -9,7 +9,6 @@ import type {CustomElement} from './custom-element.js'
 export function controller(classObject: CustomElement): void {
   const connect = classObject.prototype.connectedCallback
   classObject.prototype.connectedCallback = function (this: HTMLElement) {
-    customElements.upgrade(this)
     initializeInstance(this, connect)
   }
   initializeClass(classObject)

src/core.ts

@@ -8,6 +8,7 @@ const instances = new WeakSet<Element>()
 
 export function initializeInstance(instance: HTMLElement, connect?: (this: HTMLElement) => void): void {
   instance.toggleAttribute('data-catalyst', true)
+  customElements.upgrade(instance)
   instances.add(instance)
   autoShadowRoot(instance)
   initializeAttrs(instance)