[Wi-Fi] Ignore incorrect user certificates

These incorrect user certificates displayed when users
editing a Wi-Fi network of WPA3-Enterprise in 192bit.

Bug: 149763958
Test: make RunSettingsRoboTests ROBOTEST_FILTER=WifiConfigControllerTest
      make RunSettingsRoboTests ROBOTEST_FILTER=WifiConfigControllerTest2

Change-Id: Iab35ac975933abc54fda83b99a2109d53d6722d4

tests/robotests/src/com/android/settings/wifi/WifiConfigControllerTest.java

@@ -240,6 +240,20 @@ public class WifiConfigControllerTest {
         // No Crash
     }
 
+    @Test
+    public void loadCertificates_undesiredCertificates_shouldNotLoadUndesiredCertificates() {
+        final Spinner spinner = new Spinner(mContext);
+        when(mKeyStore.list(anyString())).thenReturn(WifiConfigController.UNDESIRED_CERTIFICATES);
+
+        mController.loadCertificates(spinner,
+                "prefix",
+                "doNotProvideEapUserCertString",
+                false /* showMultipleCerts */,
+                false /* showUsePreinstalledCertOption */);
+
+        assertThat(spinner.getAdapter().getCount()).isEqualTo(1);   // doNotProvideEapUserCertString
+    }
+
     @Test
     public void ssidGetFocus_addNewNetwork_shouldReturnTrue() {
         mController = new TestWifiConfigController(mConfigUiBase, mView, null /* accessPoint */,