Change project file back to VS 2017

Samples/BatchSupport/BatchSupport.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 17
-VisualStudioVersion = 17.0.0
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.1000
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "BatchSupport", "BatchSupport\BatchSupport.vcxproj", "{A43BD199-EC83-4B0E-9950-A2B8AA51439F}"
 	ProjectSection(ProjectDependencies) = postProject