Fix IsTank function to check client in game status (#966)

IsClientInGame check inverted

Author: Mart-User

addons/sourcemod/scripting/l4d2_fix_tank_rock_handoff.sp

@@ -74,11 +74,11 @@ void CancelPossibleTankThrow(int client)
 
 bool IsTank(int client)
 {
-	if (client <= 0 || client > MaxClients || IsClientInGame(client))
+	if (client <= 0 || client > MaxClients || !IsClientInGame(client))
 		return false;
 
 	if (GetClientTeam(client) != L4D_TEAM_INFECTED)
 		return false;
 
 	return GetEntProp(client, Prop_Send, "m_zombieClass") == L4D2_ZOMBIE_CLASS_TANK;
-}
+}