Fix test properties

Signed-off-by: SirWayne <dennis.melzer@bosch-si.com>

hawkbit-ui/src/main/java/org/eclipse/hawkbit/ui/tenantconfiguration/polling/DurationConfigField.java

@@ -59,15 +59,12 @@ public class DurationConfigField extends GridLayout implements ValueChangeListen
         if (event.getProperty() != checkBox) {
             return;
         }
-
         durationField.setEnabled(checkBox.getValue());
 
         if (!checkBox.getValue()) {
             durationField.setDuration(globalDuration);
         }
 
-        durationField.setEnabled(false);
-
         notifyConfigurationChanged();
     }