Fixed: Disabled select option still selectable

(cherry picked from commit 063dba22a803295adee4fdcbe42718af3e85ca78)

Closes #3362

frontend/src/Components/Form/MonitorNewItemsSelectInput.js

@@ -17,7 +17,7 @@ function MonitorNewItemsSelectInput(props) {
     values.unshift({
       key: 'noChange',
       value: translate('NoChange'),
-      disabled: true
+      isDisabled: true
     });
   }
 
@@ -25,7 +25,7 @@ function MonitorNewItemsSelectInput(props) {
     values.unshift({
       key: 'mixed',
       value: '(Mixed)',
-      disabled: true
+      isDisabled: true
     });
   }