Remove redundant modifiers from interfaces (#14843)

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

bundles/org.openhab.binding.monopriceaudio/src/main/java/org/openhab/binding/monopriceaudio/internal/communication/MonopriceAudioMessageEventListener.java

@@ -29,5 +29,5 @@ public interface MonopriceAudioMessageEventListener extends EventListener {
      *
      * @param event the MonopriceAudioMessageEvent
      */
-    public void onNewMessageEvent(MonopriceAudioMessageEvent event);
+    void onNewMessageEvent(MonopriceAudioMessageEvent event);
 }