WifiManagerTest: Use getPrivilegedConfiguredNetworks() in factory reset test

Bug: 152048238
Test:  atest android.net.wifi.cts.WifiManagerTest
Reproduced the original issue (i.e tests after testFactoryReset failing) with a
PSK network on the device & verified that this CL fixes the failures.

Change-Id: I56947a78142e971c8da6a1c098ebbd0f1e7d370d
diff --git a/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java b/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java
index 12db025..6613ab9 100644
--- a/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java
+++ b/tests/cts/net/src/android/net/wifi/cts/WifiManagerTest.java
@@ -2166,7 +2166,7 @@
             uiAutomation.adoptShellPermissionIdentity();
             // These below API's only work with privileged permissions (obtained via shell identity
             // for test)
-            savedNetworks = mWifiManager.getConfiguredNetworks();
+            savedNetworks = mWifiManager.getPrivilegedConfiguredNetworks();
 
             mWifiManager.factoryReset();
             // Ensure all the saved networks are removed.