Fixed: visible 'To background' button in review mode (#6363)

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### Motivation and context
Resolved #6297

### How has this been tested?
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- [x] I submit my changes into the `develop` branch
- [x] I have added a description of my changes into the
[CHANGELOG](https://github.com/opencv/cvat/blob/develop/CHANGELOG.md)
file
- [ ] I have updated the documentation accordingly
- [ ] I have added tests to cover my changes
- [x] I have linked related issues (see [GitHub docs](

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- [x] I have increased versions of npm packages if it is necessary

([cvat-canvas](https://github.com/opencv/cvat/tree/develop/cvat-canvas#versioning),

[cvat-core](https://github.com/opencv/cvat/tree/develop/cvat-core#versioning),

[cvat-data](https://github.com/opencv/cvat/tree/develop/cvat-data#versioning)
and

[cvat-ui](https://github.com/opencv/cvat/tree/develop/cvat-ui#versioning))

### License

- [x] I submit _my code changes_ under the same [MIT License](
https://github.com/opencv/cvat/blob/develop/LICENSE) that covers the
project.
  Feel free to contact the maintainers if that's a concern.

CHANGELOG.md

@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - The problem with manifest file in tasks restored from backup (<https://github.com/opencv/cvat/issues/5971>)
 - The problem with task mode in a task restored from backup (<https://github.com/opencv/cvat/issues/5668>)
+- Visible 'To background' button in review mode (<https://github.com/opencv/cvat/pull/6363>)
 - \[API\] Performance of several API endpoints (<https://github.com/opencv/cvat/pull/6340>)
 - \[API\] Invalid schema for the owner field in several endpoints (<https://github.com/opencv/cvat/pull/6343>)
 

cvat-ui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "cvat-ui",
-  "version": "1.52.0",
+  "version": "1.52.1",
   "description": "CVAT single-page application",
   "main": "src/index.tsx",
   "scripts": {

cvat-ui/src/components/annotation-page/standard-workspace/objects-side-bar/object-item-menu.tsx

@@ -60,7 +60,7 @@ function CreateURLItem(props: ItemProps): JSX.Element {
         <Menu.Item {...rest}>
             <Button
                 className='cvat-object-item-menu-create-url'
-                disabled={serverID === undefined}
+                disabled={!Number.isInteger(serverID)}
                 type='link'
                 icon={<LinkOutlined />}
                 onClick={createURL}
@@ -283,7 +283,7 @@ export default function ItemMenu(props: Props): JSX.Element {
             {is2D && !readonly && shapeType === ShapeType.CUBOID && (
                 <ResetPerspectiveItem key={MenuKeys.RESET_PERSPECIVE} toolProps={props} />
             )}
-            {is2D && objectType !== ObjectType.TAG && (
+            {is2D && !readonly && objectType !== ObjectType.TAG && (
                 <ToBackgroundItem key={MenuKeys.TO_BACKGROUND} toolProps={props} />
             )}
             {is2D && !readonly && objectType !== ObjectType.TAG && (