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
diff --git a/src/com/android/settings/deviceinfo/storage/StorageItemPreferenceController.java b/src/com/android/settings/deviceinfo/storage/StorageItemPreferenceController.java
index 7e27414..dcd2bd8 100644
--- a/src/com/android/settings/deviceinfo/storage/StorageItemPreferenceController.java
+++ b/src/com/android/settings/deviceinfo/storage/StorageItemPreferenceController.java
@@ -234,7 +234,9 @@
 
         // If isValidPrivateVolume() is true, these preferences will become visible at
         // onLoadFinished.
-        if (!isValidPrivateVolume()) {
+        if (isValidPrivateVolume()) {
+            mIsDocumentsPrefShown = isDocumentsPrefShown();
+        } else {
             setPrivateStorageCategoryPreferencesVisibility(false);
         }
     }