Fix: Don't make force start crash other players.

stepmania/Docs/SMLanProtocol.txt

@@ -256,6 +256,7 @@ NOTE: Server responces always add 128, thus a server responce for no operation
 		0: See if client has song
 		1: See if client has song, if so, scroll to song
 		2: See if client has song, if so, scroll to song, and play that song
+		3: Blindly start song
     NT		Song Title    (As gotten by GetTranslitMainTitle)
     NT		Song Artist   (As Gotten by GetTranslitArtist)
     NT		Song Subtitle (As gotten by GetTranslitSubTitle)

stepmania/src/ScreenNetSelectMusic.cpp

@@ -380,6 +380,8 @@ void ScreenNetSelectMusic::HandleScreenMessage( const ScreenMessage SM )
 
 			switch (NSMAN->m_iSelectMode)
 			{
+			case 3:
+				StartSelectedSong();
 			case 2: //We need to do cmd 1 as well here
 				if (haveSong)
 				{