No mouse decorator when dragging Event Dispatcher from My Blueprint panel

Currently there is no mouse decorator when dragging event dispatchers out of the My Blueprints panel in the Blueprint editor.

This contradicts the functionality of drag-and-dropping variables, functions, and events. Not a regression.

Found on:
UE4-Main: //depot/UE4/Promotable-CL-2554325
4.8 Binary: 4.8.0-2556684+++depot+UE4-Releases+4.8

1. Open UE4Editor.exe QAGAME
2. Create a new blueprint class based on actor and open it in the blueprint editor
3. In the My Blueprint panel, press the + next to Event Dispatchers to create one
4. Click-Drag the event dispatcher from the my blueprint panel

Result: No indication that you're dragging the event dispatcher (via mouse decoration)

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