fix: use boolean instead of Boolean

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

src/main/java/com/flowingcode/vaadin/addons/chatassistant/ChatMessage.java

@@ -52,7 +52,7 @@ public class ChatMessage extends Component implements HasComponents {
    * 
    * @param message message used to populate the ChatMessage instance
    */
-  public ChatMessage(Message message, Boolean markdownEnabled) {
+  public ChatMessage(Message message, boolean markdownEnabled) {
     this.markdownEnabled = markdownEnabled;
     setMessage(message);
   }