fix test for fsharp/fsharp edition (2)

Author: dsyme

src/fsharp/FSharp.Build-proto/Microsoft.FSharp-proto.targets

@@ -218,7 +218,6 @@ Copyright (C) Microsoft Corporation. Apache 2.0 License.
           ToolPath="$(FscToolPath)"
           TreatWarningsAsErrors="$(TreatWarningsAsErrors)"
           Utf8Output="$(Utf8Output)"
-          ValidateTypeProviders="$(ValidateTypeProviders)"
           VersionFile="$(VersionFile)"
           VisualStudioStyleErrors="$(VisualStudioStyleErrors)"
           WarningLevel="$(WarningLevel)"