MP: Civil trains despite Civil Traffic OFF

[Nealius]

Client civil traffic OFF. Server civil traffic OFF. Mission options civil traffic OFF but not enforced.

When played offline, only user-placed train units are generated.

When played online, user-placed train units and civil trains are generated for both server and client. Civil road traffic (cars) remains off. 

See attached client track.

Sandbox Afternoon-20211014-190026.trk