Disable build of legacy ASP.NET projects

The build server uses `dotnet build`, which doesn't support legacy project files (i.e., prior to **Visual Studio 2017**'s format). Unfortunately, **ASP.NET Framework** projects don't support the new format. Fortunately, these are exclusively for local testing, and aren't strictly needed on the build server, so we're working around this by disabling the default build configuration for _Release_.

Author: JeremyCaney

OnTopic.sln

@@ -93,19 +93,16 @@ Global
 		{2AC4B63B-16D3-4398-BAEB-E9EF3A7636A8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{2AC4B63B-16D3-4398-BAEB-E9EF3A7636A8}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{2AC4B63B-16D3-4398-BAEB-E9EF3A7636A8}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{2AC4B63B-16D3-4398-BAEB-E9EF3A7636A8}.Release|Any CPU.Build.0 = Release|Any CPU
 		{FE175884-59C1-4C4D-A663-4CC570432ECC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{FE175884-59C1-4C4D-A663-4CC570432ECC}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{FE175884-59C1-4C4D-A663-4CC570432ECC}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{FE175884-59C1-4C4D-A663-4CC570432ECC}.Release|Any CPU.Build.0 = Release|Any CPU
 		{ECA95F46-BE8F-4CD3-BF67-56A747E2C2F4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{ECA95F46-BE8F-4CD3-BF67-56A747E2C2F4}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{ECA95F46-BE8F-4CD3-BF67-56A747E2C2F4}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{ECA95F46-BE8F-4CD3-BF67-56A747E2C2F4}.Release|Any CPU.Build.0 = Release|Any CPU
 		{5CEBC2AE-7A33-4F8A-B45F-29BEFB56E013}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{5CEBC2AE-7A33-4F8A-B45F-29BEFB56E013}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{5CEBC2AE-7A33-4F8A-B45F-29BEFB56E013}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{5CEBC2AE-7A33-4F8A-B45F-29BEFB56E013}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE