Remove search duplicates for Wifi and Bluetooth

Remove the master switch duplicates between the switch
and their targets. Only show the actual Wifi and Bluetooth
settings as search results.

Bug: 33701673
Test: make RunSettingsRoboTests
Change-Id: I226cc8db40a308bd9bcfacdd4fc6ae709fb809c5

src/com/android/settings/network/NetworkDashboardFragment.java

@@ -142,5 +142,13 @@ public class NetworkDashboardFragment extends DashboardFragment implements
                     sir.xmlResId = R.xml.network_and_internet;
                     return Arrays.asList(sir);
                 }
+
+                @Override
+                public List<String> getNonIndexableKeys(Context context) {
+                    List<String> keys = new ArrayList<>();
+                    // Remove master switch as a result
+                    keys.add(WifiMasterSwitchPreferenceController.KEY_TOGGLE_WIFI);
+                    return keys;
+                }
             };
 }