Disable broadcast option for send custom notification if backend is Icinga 2

modules/monitoring/application/forms/Command/Object/SendCustomNotificationCommandForm.php

@@ -59,8 +59,11 @@ class SendCustomNotificationCommandForm extends ObjectsCommandForm
                         . ' whether or not notifications are enabled.'
                     )
                 )
-            ),
-            array(
+            )
+        ));
+
+        if (! $this->getBackend()->isIcinga2()) {
+            $this->addElement(
                 'checkbox',
                 'broadcast',
                 array(
@@ -70,8 +73,9 @@ class SendCustomNotificationCommandForm extends ObjectsCommandForm
                         'If you check this option, the notification is sent out to all normal and escalated contacts.'
                     )
                 )
-            )
-        ));
+            );
+        }
+
         return $this;
     }