Record attack custom exit fix

This fixes the bug reported here: http://mb.srb2.org/showthread.php?t=42342

Record Attack now no longer allows the tally to be skipped, whether by custom exits or by Lua etc.

src/g_game.c

@@ -2888,7 +2888,7 @@ static void G_DoCompleted(void)
if (nextmap < NUMMAPS && !mapheaderinfo[nextmap])
P_AllocMapHeader(nextmap);
-	if (skipstats)
+	if (skipstats && !modeattacking) // Don't skip stats if we're in record attack
G_AfterIntermission();
else
{