Remove redundant modifiers from interfaces (#14843)

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

bundles/org.openhab.io.openhabcloud/src/main/java/org/openhab/io/openhabcloud/internal/CloudClientListener.java

@@ -30,5 +30,5 @@ public interface CloudClientListener {
      * @param item the {@link String} containing item name
      * @param command the {@link String} containing a command
      */
-    public void sendCommand(String item, String command);
+    void sendCommand(String item, String command);
 }