Remove redundant modifiers from interfaces (#14843)

Signed-off-by: Wouter Born <github@maindrain.net>

bundles/org.openhab.binding.rotel/src/main/java/org/openhab/binding/rotel/internal/protocol/RotelMessageEventListener.java

@@ -30,5 +30,5 @@ public interface RotelMessageEventListener extends EventListener {
      *
      * @param event the event object
      */
-    public void onNewMessageEvent(EventObject event);
+    void onNewMessageEvent(EventObject event);
 }