fix: add uses annotation for ClipboardHelper class

Author: paodb

src/main/java/com/flowingcode/vaadin/addons/errorwindow/ErrorWindow.java

@@ -26,6 +26,7 @@
 import com.vaadin.flow.component.button.Button;
 import com.vaadin.flow.component.button.ButtonVariant;
 import com.vaadin.flow.component.dependency.CssImport;
+import com.vaadin.flow.component.dependency.Uses;
 import com.vaadin.flow.component.dialog.Dialog;
 import com.vaadin.flow.component.html.Div;
 import com.vaadin.flow.component.icon.VaadinIcon;
@@ -47,6 +48,7 @@
  * @author pbartolo
  */
 @SuppressWarnings("serial")
+@Uses(ClipboardHelper.class)
 @CssImport(value = "./flowingcode/error-window.css")
 public class ErrorWindow extends Dialog {