Converge on same naming convention for snapshots in the preview tests as in the UI tests.

ElementX.xcodeproj/xcshareddata/xcschemes/PreviewTests.xcscheme

@@ -4,8 +4,7 @@
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"
-      buildImplicitDependencies = "YES"
-      runPostActionsOnFailure = "NO">
+      buildImplicitDependencies = "YES">
       <BuildActionEntries>
          <BuildActionEntry
             buildForTesting = "YES"
@@ -30,12 +29,6 @@
       shouldUseLaunchSchemeArgsEnv = "YES"
       codeCoverageEnabled = "YES"
       onlyGenerateCoverageForSpecifiedTargets = "YES">
-      <TestPlans>
-         <TestPlanReference
-            default = "YES"
-            reference = "container:PreviewTests/SupportingFiles/PreviewTests.xctestplan">
-         </TestPlanReference>
-      </TestPlans>
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"
@@ -45,10 +38,6 @@
             ReferencedContainer = "container:ElementX.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <Testables>
-      </Testables>
-      <CommandLineArguments>
-      </CommandLineArguments>
       <CodeCoverageTargets>
          <BuildableReference
             BuildableIdentifier = "primary"
@@ -58,6 +47,12 @@
             ReferencedContainer = "container:ElementX.xcodeproj">
          </BuildableReference>
       </CodeCoverageTargets>
+      <TestPlans>
+         <TestPlanReference
+            reference = "container:PreviewTests/SupportingFiles/PreviewTests.xctestplan"
+            default = "YES">
+         </TestPlanReference>
+      </TestPlans>
    </TestAction>
    <LaunchAction
       buildConfiguration = "Debug"
@@ -78,8 +73,6 @@
             ReferencedContainer = "container:ElementX.xcodeproj">
          </BuildableReference>
       </MacroExpansion>
-      <CommandLineArguments>
-      </CommandLineArguments>
    </LaunchAction>
    <ProfileAction
       buildConfiguration = "Release"
@@ -87,8 +80,6 @@
       savedToolIdentifier = ""
       useCustomWorkingDirectory = "NO"
       debugDocumentVersioning = "YES">
-      <CommandLineArguments>
-      </CommandLineArguments>
       <MacroExpansion>
          <BuildableReference
             BuildableIdentifier = "primary"