Fix Wi-Fi details crash in secondary users

- When Wi-Fi details are restricted for secondary users, UI components will be removed to prevent user interaction
  - The UI update function may not obtain the expected resources, causing NPE issues

Bug: 362151753
Flag: EXEMPT bugfix
Test: Manual testing
atest -c WifiNetworkDetailsFragmentTest

Change-Id: Ia97b4e202faff85ced0b6eaf2e4b4f0dc04b5cef

src/com/android/settings/wifi/details/WifiNetworkDetailsFragment.java

@@ -400,6 +400,9 @@ public class WifiNetworkDetailsFragment extends RestrictedDashboardFragment impl
 
     @VisibleForTesting
     void onHotspotNetworkChanged(WifiNetworkDetailsViewModel.HotspotNetworkData data) {
+        if (mIsUiRestricted) {
+            return;
+        }
         PreferenceScreen screen = getPreferenceScreen();
         if (screen == null) {
             return;

tests/robotests/src/com/android/settings/wifi/details/WifiNetworkDetailsFragmentTest.java

@@ -32,6 +32,7 @@ import static com.android.wifitrackerlib.WifiEntry.WIFI_LEVEL_MAX;
 
 import static com.google.common.truth.Truth.assertThat;
 
+import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.doReturn;
@@ -246,6 +247,15 @@ public class WifiNetworkDetailsFragmentTest {
                 .setSignalStrengthTitle(R.string.hotspot_connection_strength);
     }
 
+    @Test
+    public void onHotspotNetworkChanged_uiRestricted_doNothing() {
+        mFragment.mIsUiRestricted = true;
+
+        mFragment.onHotspotNetworkChanged(null /* HotspotNetworkData */);
+
+        verify(mScreen, never()).findPreference(any());
+    }
+
     @Test
     public void updateInternetSource_networkTypeWifi_setWifiResource() {
         doReturn(mDrawable).when(mContext)