Behavior Tree Service Deactivation is called after Blackboard Component is destroyed

When exiting PIE the Behavior Tree Service Deactivation is called after Blackboard Component is destroyed.

1. Down load attached project
2. Open the project
3. Open the output log
4. Play in Editor
5. Press the 'F' to spawn in an AI
6. Run up to the AI and then run away
7. Press the 'Esc" key to exit PIE
8. Look into the output logs
9. Notice that the black board is returning a null value (image attached for reference)

Expected: The variable in the black board should return the ThirdpersonCharacter value for the variable SelfActor upon deactivation
Result: The BB variable returns a null value upon deactivation

Fix UE-51650

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