Scalar Parameter versus Constant placed in Alpha of LERP produces inconsistent results in Blendable

When placing a Scalar Parameter into the Alpha position of a LERP you will not get the same results as placing a Constant Value when used in a Post Process Material.

Constant Value of 0:
[Image Removed]

Constant Value of 1:
[Image Removed]

Scalar Value of 0:
[Image Removed]

Scalar Value of 1:
[Image Removed]

Also Reproduced in Main Promotable-CL-2579896 & Releases/4.8/Promoted-CL-2573784

1. Open QAGame Editor
2. Recreate Post Process Material Pictured Above
3. Assign Material to Unbound Post Process Volume in Level
4. Plug in a Constant 1 into Alpha of LERP in Post Process Material.
5. Plug in a Scalar Parameter 1 into Alpha of LERP in Post Process Material.

RESULTS: Blendable Material does not look the same when using a Scalar and a Constant

EXPECTED: The Blendable should produce the same results no matter a Scalar or a Constant.

Fix UE-51650

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