improve bridge settings interaction in location selection fragment

• update visibility of the recommended location's bridge icon according to bridge setting changes
• show reset bridges hint only if the provider supports connecting without them.

app/src/main/java/se/leap/bitmaskclient/base/fragments/GatewaySelectionFragment.java

@@ -48,8 +48,6 @@ import java.beans.PropertyChangeEvent;
 import java.beans.PropertyChangeListener;
 import java.lang.ref.WeakReference;
 import java.util.List;
-import java.util.Observable;
-import java.util.Observer;
 
 import de.blinkt.openvpn.core.VpnStatus;
 import de.blinkt.openvpn.core.connection.Connection;
@@ -144,10 +142,11 @@ public class GatewaySelectionFragment extends Fragment implements PropertyChange
     }
 
     private void initBridgesHint(@NonNull View view) {
+        boolean allowResettingBridges = getUseBridges() && gatewaysManager.hasLocationsForOpenVPN();
         bridgesHint = view.findViewById(R.id.manual_subtitle);
-        bridgesHint.setVisibility(getUseBridges() ? VISIBLE : GONE);
+        bridgesHint.setVisibility(allowResettingBridges ? VISIBLE : GONE);
         disableBridges = view.findViewById(R.id.disable_bridges);
-        disableBridges.setVisibility(getUseBridges() ? VISIBLE : GONE);
+        disableBridges.setVisibility(allowResettingBridges ? VISIBLE : GONE);
         disableBridges.setOnClickListener(v -> {
             useBridges(false);
         });
@@ -218,6 +217,7 @@ public class GatewaySelectionFragment extends Fragment implements PropertyChange
             locationListAdapter.updateTransport(selectedTransport, gatewaysManager);
             bridgesHint.setVisibility(showBridges ? VISIBLE : GONE);
             disableBridges.setVisibility(showBridges ? VISIBLE : GONE);
+            updateRecommendedLocation();
         }
     }