Preview Background Feature Removed From UMG In 4.13

Widget Blueprint no longer has "Preview Background" feature in 4.13. This is misleading since the documentation mentions to use this in the workflow here: https://docs.unrealengine.com/latest/INT/Engine/UMG/UserGuide/BestPractices/

1. Open blank 4.13 project
2. Create new widget blueprint
3. Select top most element in hierarchy (above canvas panel)

RESULT
Designer section removed along with "Preview Background" Feature

EXPECTED
Designer section along with "Preview Background" Feature still there

Fix UE-51650

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