[Server] Group law cars

[akosd127]

Code:

new vehicleid = GetPlayerVehicleID(playerid);

if(newstate == PLAYER_STATE_DRIVER && isPoliceCar(vehicleid))
{
    //do something
}

stock isPoliceCar(vehicleid)
{
    new vehiclemodel = GetVehicleModel(vehicleid);

    switch(vehiclemodel)
    {
        case 595: return true;
        case 596: return true;
        case 597: return true;
        case 599: return true;
    }

    return false;
}

Edit:
I really forgot. Now fixed.