Merge pull request #5393 from aws-lumberyard-dev/Atom/santorac/FixSkinScreenshotTests

Updated 002_wrinkle_regression_test.material to avoid subsurface scattering artifacts

Having subsurface scattering into a completely back area is an unrealistic scenario and caused colored artifacts. I changed the material to mask out the black areas from applying SS. Corresponding changes will be made to the expceted screenshot in AtomSampleViewer as well.

Gems/Atom/TestData/TestData/Materials/SkinTestCases/002_wrinkle_regression_test.material

@@ -33,7 +33,7 @@
         },
         "subsurfaceScattering": {
             "enableSubsurfaceScattering": true,
-            "influenceMap": "Objects/Lucy/Lucy_thickness.tif",
+            "influenceMap": "TestData/Textures/checker8x8_gray_512.png",
             "scatterDistance": 15.0,
             "subsurfaceScatterFactor": 0.4300000071525574,
             "thicknessMap": "Objects/Lucy/Lucy_thickness.tif",
@@ -47,8 +47,7 @@
                 0.3182879388332367,
                 0.16388189792633058,
                 1.0
-            ],
-            "useInfluenceMap": false
+            ]
         },
         "wrinkleLayers": {
             "baseColorMap1": "TestData/Textures/cc0/Lava004_1K_Color.jpg",