On configuration removal, take it away from foundConfigurations

Prevents derefence of freed QNetworkConfigurationPrivate pointer in
QConnmanEngine::getConfigurations().
original submitter:  Jakub Adam <jakub.adam@jollamobile.com>

Change-Id: Ib915c5a68aeb3196c6ac91c96338ebee9dad30b6
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>

src/plugins/bearer/connman/qconnmanengine.cpp

@@ -495,6 +495,7 @@ void QConnmanEngine::removeConfiguration(const QString &id)
         serviceNetworks.removeOne(service);
 
         QNetworkConfigurationPrivatePointer ptr = accessPointConfigurations.take(id);
+        foundConfigurations.removeOne(ptr.data());
         locker.unlock();
         emit configurationRemoved(ptr);
         locker.relock();