Also try connecting shared on newly created network configurations

Summary: If a new QNetworkConfiguration appears which is already set to online then we would miss the update.

Test Plan: Compiles. It's purely a hypothetical case based on looking at QNetworkConfigurationManager

Reviewers: apol, adridg, chinmoyr

Reviewed By: apol

Differential Revision: https://phabricator.kde.org/D18123