Windows test runner uses same target version as Windows app.

src/Mobile/eShopOnContainers/eShopOnContainers.TestRunner.Windows/eShopOnContainers.TestRunner.Windows.csproj

@@ -11,7 +11,7 @@
     <AssemblyName>eShopOnContainers.TestRunner.Windows</AssemblyName>
     <DefaultLanguage>en-US</DefaultLanguage>
     <TargetPlatformIdentifier>UAP</TargetPlatformIdentifier>
-    <TargetPlatformVersion>10.0.14393.0</TargetPlatformVersion>
+    <TargetPlatformVersion>10.0.10586.0</TargetPlatformVersion>
     <TargetPlatformMinVersion>10.0.10586.0</TargetPlatformMinVersion>
     <MinimumVisualStudioVersion>14</MinimumVisualStudioVersion>
     <FileAlignment>512</FileAlignment>