Remove redundant modifiers from interfaces (#14843)

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

bundles/org.openhab.binding.oppo/src/main/java/org/openhab/binding/oppo/internal/communication/OppoMessageEventListener.java

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