Make Nfc/Beam searchable based on feature availability

Update logic of updateNonIndexableKeys,
in BaseNfcPreferenceController to fix issue.
Add robotest to avoid same problem.

Change-Id: I1de5324b5a7147ff58e3c366ee7e8cf858e3283c
Fixes: 78540155
Test: make RunSettingsRoboTests

src/com/android/settings/nfc/BaseNfcPreferenceController.java

@@ -67,7 +67,7 @@ public abstract class BaseNfcPreferenceController extends AbstractPreferenceCont
 
     @Override
     public void updateNonIndexableKeys(List<String> keys) {
-        if (isAvailable()) {
+        if (!isAvailable()) {
             keys.add(getPreferenceKey());
         }
     }