RenderTarget Texture Alpha rendered incorrectly when SceneCapture2D AA set to true

The Alpha Channel of the Render Target Texture is rendered as a value of 1 (solid white) when the SceneCapture2D actor is set to LDR with PP and Anti-Aliasing is set to true in the General Show Flags. With Anti-Aliasing set to false the Alpha Channel renders correctly.

AA=True:
[Image Removed]

AA=False:
[Image Removed]

Reproduced in Dev-Rendering CL 2817080 and 4.11 Preview 1

*Quick Reproduction in Attached 4.10.1 Project*

1. Create a New Blank Project with No Starter Content
2. Add a Scene Capture 2D actor
3. Set the actor to use LDR with Post Process
4. Duplicate the Scene Capture 2D actor
5. In the Duplicate, under General Show Flags set Anti-Aliasing to False
6. Add Two RenderTarget Textures and assign one to each of the Scene Capture 2D
7. Build to make sure the Render Target Textures are filled in
8. Open the Render Target Textures in the Texture Editor
9. In both Textures only show the Alpha Channel

RESULTS: In the AA=True (Default) Scene Capture, the Alpha Channel renders as a value of 1 (Solid White)

EXPECTED: Both Textures retain the Alpha Values shown in the AA=False RenderTarget Texture

Fix UE-51650

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