Refreshes metadata for a lobby you're not necessarily in right now
you never do this for lobbies you're a member of, only if your
this will send down all the metadata associated with a lobby
this is an asynchronous call
returns false if the local user is not connected to the Steam servers
results will be returned by a LobbyDataUpdate_t callback
if the specified lobby doesn't exist, LobbyDataUpdate_t::m_bSuccess will be set to false