AI traffic: Police configuration bug

Hello,

I've noticed a bug since 0.28 (though I cannot say for sure if the bug was introduced in previous versions), in which a player's police vehicle is not determined as such when spawning traffic with police. This only occurs if a police vehicle ,saved as the default vehicle, is spawned.

Steps to reproduce the issue:

1. Open a map of your choice. I've selected West Coast USA.
   
2. Select a police configured vehicle, such as the Bruckell Bastion Police 5.7 AWD (A). [It is important to select a configuration in which "Config Type":"police" is found in the JSON file, or the word "police" is in the JSON file's name.]
3. Save the vehicle as the default vehicle.
4. Now replace the vehicle with the default vehicle.
5. Spawn traffic AI with police.
6. Drive recklessly and wait for the police to pursue you.
7. Now replace your vehicle with the same vehicle in Step 2.
8. Drive recklessly. The police will not chase you, as expected.