Exclude standby firewalls from path calculation results

NetBrain path calculation currently displays standby (passive) firewall devices in path results even though these devices do not carry live traffic, since failover has not occurred. This can create confusion when reviewing a path, as the standby device appears as an active hop despite not participating in actual traffic flow. This enhancement would allow path calculation to identify standby firewalls and exclude them from the displayed path result, regardless of branch or topology. Customers troubleshooting network paths would gain a more accurate representation of real traffic flow, reducing the time spent distinguishing active devices from standby ones during analysis.