When playing matinee, scrubbing can cause sound to keep playing when it isn't triggered

Note: This was entered as a bug to re-work the fix from the pull request found here: UE-27709

Steps to Reproduce

1. Download and import the attached WAV file
2. Create a sound cue from the sound wave
3. Create a matinee in your level and make it last 10 seconds
4. Create an empty group and add a sound track to it
5. Select the Sound Cue in the content browser
6. Scrub to 6 seconds with the Sound Track selected and hit enter
7. Scrub to 5 seconds and play
8. When it gets to 8 seconds or so, scrub it back to 3 seconds
9. Hit play again

Result: Sound plays immediately, but as if it was at the 8 second mark
Expected: No sound at all because the sound is not triggered at 3 seconds

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Affects Versions4.11
Target Fix4.13
Fix Commit3080849
Main Commit3092051
Release Commit3080849
CreatedMay 31, 2016
ResolvedAug 8, 2016
UpdatedApr 27, 2018