don't overwrite "name" in mpconnect

and also remove unneeded code.
we not don't overwrite "name" (the name of the leader) in mp connect if
it given by the scenario.
We also fix a previous commit "don't generate 'user_description' on the
host" which caused that the AI algorithm wasn't shown to the clients.
don't remember which client controlls an ai side

in [multiplayer] side_controllers=