adding Fortigate switches to Oxidized model mapping config

[LoveSkylark]

Correctly Oxidized extension is unable to identify FortiGate Switches, this adjust the config defaults so it is ready.

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[librenms-bot]

This pull request has been mentioned on LibreNMS Community. There might be relevant details there:

https://community.librenms.org/t/23-1-0-changelog/20671/1