Fix Wi-Fi anonymous ID UI issue

- Do not reset the anonymous default ID after retrieving the previous value from WifiConfiguration.

Fix: 267517525
Flag: None
Test: manual test
make RunSettingsRoboTests ROBOTEST_FILTER=WifiConfigController2Test

Change-Id: Ic10d6953f6657836e18eab6884df2af0f35a20c4

src/com/android/settings/wifi/WifiConfigController2.java

@@ -1382,7 +1382,11 @@ public class WifiConfigController2 implements TextWatcher,
 
     @VisibleForTesting
     void setAnonymousIdVisible() {
-        mView.findViewById(R.id.l_anonymous).setVisibility(View.VISIBLE);
+        View view = mView.findViewById(R.id.l_anonymous);
+        if (view.getVisibility() == View.VISIBLE) {
+            return;
+        }
+        view.setVisibility(View.VISIBLE);
         mEapAnonymousView.setText(DEFAULT_ANONYMOUS_ID);
     }