Remove non-needed ExcludeFromSourceBuild switch

Projects that offer a .NETFramework TFM only are already automatically
removed by arcade's TFM filtering that is enabled for source-build.

Author: ViktorHofer

src/Microsoft.Build.Tasks.Tfvc/Microsoft.Build.Tasks.Tfvc.csproj

@@ -4,7 +4,6 @@
   <PropertyGroup>
     <TargetFramework>net472</TargetFramework>
     <AutoGenerateAssemblyVersion>true</AutoGenerateAssemblyVersion>
-    <ExcludeFromSourceBuild>true</ExcludeFromSourceBuild>
     <SuppressFinalPackageVersion>true</SuppressFinalPackageVersion>
 
     <!-- NuGet: Using an explicit nuspec file to customize TFM directory -->

src/SourceLink.AzureRepos.Tfvc/Microsoft.SourceLink.AzureRepos.Tfvc.csproj

@@ -4,7 +4,6 @@
   <PropertyGroup>
     <TargetFramework>net472</TargetFramework>
     <AutoGenerateAssemblyVersion>true</AutoGenerateAssemblyVersion>
-    <ExcludeFromSourceBuild>true</ExcludeFromSourceBuild>
     <SuppressFinalPackageVersion>true</SuppressFinalPackageVersion>
 
     <!-- Using an explicit nuspec file due to https://github.com/NuGet/Home/issues/6754 -->