Flow indicators between sound cue links don't update unless the mouse cursor is moved

The orange flow indicator that appears won't update graphically if there is no user input so if you Play an audio cue and don't move your mouse you won't get realtime feedback of what is going in.

Regression, works in 4.12.

Haven't checked this in Main and I haven't check to see if this occurs with blueprint visualisations.

Relatively minor bug

1. Sync to Dev-Framework QAGame
2. Compile and open QAGame
3. In the content browser Right click and create a Sound Cue (Sounds-> Sound Cue)
4. Open the Sound Cue and Right click near Output
5. Type in Wave and Select Wave Player
6. With the Wave Player Selected in the Details Panel Click the dropdown next to sound wave and select Dialog01
7. Click the looping Tickbox
8. Connect the Wave player to the output
9. Click Play Cue at the top of the Window
10. Don't move the Mouse cursor
    Result Audio loops and the orange flow indicator doesn't update, to indicate the flow of commands

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