chore(ui5-illustrated-message): remove unnecessary imports from sample (#12709)

Author: kgogov

packages/fiori/test/pages/IllustratedMessageCustom.html

@@ -74,8 +74,6 @@ <h2>Unsafe registration (raw strings)</h2>
 	</div>
 
 	<script type="module">
-		import "@ui5/webcomponents/dist/Button.js";
-		import "@ui5/webcomponents-fiori/dist/IllustratedMessage.js";
 		import { registerIllustration, unsafeRegisterIllustration } from "@ui5/webcomponents-base/dist/asset-registries/Illustrations.js";
 		import { jsx } from "@ui5/webcomponents-base/dist/jsx-runtime.js";