Unable to bind events to OnPerceptionUpdated in Blueprints

Attempting to bind an event to OnPerceptionUpdated results in an error in Blueprints. It seems that this is caused by the TArray in the function signature not being a constant reference.

Current code:

DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FPerceptionUpdatedDelegate, TArray, UpdatedActors);

Note: The reproduction case provided is blocked in Main CL# 3810327 as a crash occurs on step 4

Regression?: No
This occurred in 4.17

1. Create a new project
2. Add a new Blueprint actor
3. In the Event Graph, create a Get Component by Class node and set the Component class to AIPerception Component
4. Drag off the node's Return Value and create a "Bind Event to OnPerceptionUpdated" node
5. Connect the execution pin from Event Begin Play to Bind Event to OnPerceptionUpdated
6. Compile the Blueprint
   Result: The blueprint throws an error, saying that the event does not match the signature
   Expected: The blueprint compiles successfully

Fix UE-51650

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