Update icon path and remove unused files

Author: acoumb

src/Umbraco.Cms.Integrations.Crm.ActiveCampaign/Client/src/icons/icons-dictionary.ts

@@ -1,6 +1,6 @@
 export default [
     {
         name: 'icon-activecampaign',
-        path: () => import('./activecampaign.ts')
+        path: () => import('./activecampaign.js')
     }
 ];

src/Umbraco.Cms.Integrations.Crm.ActiveCampaign/Client/src/icons/index.ts

@@ -0,0 +1,8 @@
+import type { ManifestTypes } from '@umbraco-cms/backoffice/extension-registry';
+
+export const manifest: Array<ManifestTypes> = [{
+	type: 'icons',
+	name: 'ActiveCampaign Icon',
+	alias: 'activecampaign.icon',
+	js: () => import('./icons-dictionary.js'),
+}];