[PATCH] Only send game reports if the game is actually rated

[leper]

Currently we send game reports for lobby games for every lobby game. This should only be done for rated games.

To make the rating system extendable the clients should ask the bot if the current game is rated (possibly at the start of the game) and only in this case send the game report.

[elexis]

Looking at session.js, this seems to be the case already:

function reportGame()
{
	if (!Engine.HasXmppClient() || !Engine.IsRankedGame())
		return;

But I guess we could also early-return in case numPlayers != 2.

Why would we have to contact the lobbybot to findout if its rated?

[elexis]

In 18018:

Only send a gamereport to the lobbybot for 1v1s (as only those are rated), fixes #3040.