docs(uui-input): add missing imports for icon

Author: iOvergaard

packages/uui-input/lib/uui-input.story.ts

@@ -1,5 +1,7 @@
 import '@umbraco-ui/uui-button/lib';
 import '@umbraco-ui/uui-input/lib';
+import '@umbraco-ui/uui-icon-registry-essential/lib';
+import '@umbraco-ui/uui-icon/lib';
 
 import { Story } from '@storybook/web-components';
 import { html } from 'lit';