Fix 'Documents & other' missing problem

Should check if 'Documents & other' is visible
when mVolume is updated.

Bug: 230215783
Test: manual visual
      Settings -> Storage
Change-Id: Ife36b71bee66ff16802e352785824e10c17dceb8

src/com/android/settings/deviceinfo/storage/StorageItemPreferenceController.java

@@ -234,7 +234,9 @@ public class StorageItemPreferenceController extends AbstractPreferenceControlle
 
         // If isValidPrivateVolume() is true, these preferences will become visible at
         // onLoadFinished.
-        if (!isValidPrivateVolume()) {
+        if (isValidPrivateVolume()) {
+            mIsDocumentsPrefShown = isDocumentsPrefShown();
+        } else {
             setPrivateStorageCategoryPreferencesVisibility(false);
         }
     }