Fixed the target framework by using the TFM

The following commit removed the honoring of the NuGetTargetFramework:

NuGet/NuGet.Client@b3ea8fd

Author: adalon

src/VisualStudio/NuGet.Packaging.VisualStudio/Targets/NuGet.Packaging.Authoring.targets

@@ -16,7 +16,7 @@ Copyright (c) .NET Foundation. All rights reserved.
   <PropertyGroup>
     <ProjectSystemRulesDir Condition="'$(ProjectSystemRulesDir)' == ''">$(MSBuildThisFileDirectory)..\Rules\</ProjectSystemRulesDir>
     <RestoreProjectStyle>PackageReference</RestoreProjectStyle>
-    <NuGetTargetFramework>dotnet</NuGetTargetFramework>
+    <TargetFrameworkMoniker>NETFramework,Version=v1.0</TargetFrameworkMoniker>
     <PackageTargetFallback>net11;net20;net35;net40;net403;net45;net451;net452;net46;net461;net462;netcore;netcore45;netcore451;netcore50;win8;win81;win10;sl4;sl5;wp;wp7;wp75;wp8;wp81;wpa81;uap;uap10;netstandard1.0;netstandard1.1;netstandard1.2;netstandard1.3;netstandard1.4;netstandard1.5;netstandard1.6;netcoreapp1.0;monoandroid;monotouch;monomac;xamarinios;xamarinmac;xamarinpsthree;xamarinpsfour;xamarinpsvita;xamarinwatchos;xamarintvos;xamarinxboxthreesixty;xamarinxboxone</PackageTargetFallback>
   </PropertyGroup>