Do not restart Vidalia on network reconnect
Originally created by Tails on #5840 (Redmine)
Due to Vidalia’s Vidalia bug 2150, we restart Vidalia after network reconnection.
Note that we now only start Tor once the network is up, so only _re_connection to the network is affected. So, the other potential place to fix the bug (Tor bug 1247 is not an option anymore.