Admin Page: avoid react warning with VideoPress card (#34713)

This should avoid us getting the following warning:

```
Warning: Failed prop type: Invalid prop `overrideContent` of type `boolean` supplied to `DashItem`, expected a single ReactElement.
DashItem@wp-content/plugins/jetpack/_inc/build/admin.js?ver=28b3a12169ab227bdcfa:36878:1
SettingsForm@wp-content/plugins/jetpack/_inc/build/admin.js?ver=28b3a12169ab227bdcfa:43524:3
ConnectFunction@wp-content/plugins/jetpack/_inc/build/admin.js?ver=28b3a12169ab227bdcfa:8870:68
ConnectFunction@wp-content/plugins/jetpack/_inc/build/admin.js?ver=28b3a12169ab227bdcfa:8870:68
DashVideoPress@wp-content/plugins/jetpack/_inc/build/admin.js?ver=28b3a12169ab227bdcfa:34467:1
```

projects/plugins/jetpack/_inc/client/at-a-glance/videopress.jsx

@@ -128,8 +128,7 @@ class DashVideoPress extends Component {
 				className="jp-dash-item__is-inactive"
 				noToggle={ ! hasConnectedOwner }
 				overrideContent={
-					! hasConnectedOwner &&
-					! isOffline && (
+					! hasConnectedOwner && ! isOffline ? (
 						<JetpackBanner
 							callToAction={ __( 'Connect', 'jetpack' ) }
 							title={ __(
@@ -143,7 +142,7 @@ class DashVideoPress extends Component {
 							plan={ getJetpackProductUpsellByFeature( FEATURE_VIDEOPRESS ) }
 							icon="video"
 						/>
-					)
+					) : null
 				}
 			>
 				<p className="jp-dash-item__description">

projects/plugins/jetpack/changelog/fix-warning-videopress-card

@@ -0,0 +1,4 @@
+Significance: patch
+Type: other
+
+Dashboard: avoid React warning when loading the VideoPress card.