Fix/suppress PMD CompareObjectsWithEquals findings (#11476)

Newer PMD versions discover more CompareObjectsWithEquals findings.

Related to https://github.com/openhab/static-code-analysis/pull/423

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

bundles/org.openhab.binding.mqtt/src/main/java/org/openhab/binding/mqtt/handler/SystemBrokerHandler.java

@@ -93,6 +93,7 @@ public class SystemBrokerHandler extends AbstractBrokerHandler implements MqttSe
      * is no connection established yet.
      */
     @Override
+    @SuppressWarnings("PMD.CompareObjectsWithEquals")
     public void brokerAdded(String connectionName, MqttBrokerConnection addedConnection) {
         if (!connectionName.equals(brokerID) || connection == addedConnection) {
             return;