Correct the calling method in removeDefaultNetworkActiveListener

The removeDefaultNetworkActiveListener should do the
unregisteration but it's incorrectly calling
registerNetworkActivityListener into the ConnectivityService.

Bug: 199753782
Test: atest FrameworksNetTests CtsNetTestCases
Change-Id: I65a2ddc82989d736316d51f5058e707f5b261a82

framework/src/android/net/ConnectivityManager.java

@@ -2369,7 +2369,7 @@ public class ConnectivityManager {
             throw new IllegalArgumentException("Listener was not registered.");
         }
         try {
-            mService.registerNetworkActivityListener(rl);
+            mService.unregisterNetworkActivityListener(rl);
         } catch (RemoteException e) {
             throw e.rethrowFromSystemServer();
         }