remove redundant DefineConstants (#6797)

Author: SimonCropp

src/core/Akka.Remote.Tests.MultiNode/Akka.Remote.Tests.MultiNode.csproj

@@ -25,8 +25,4 @@
     <Reference Include="System.Xml.Linq" />
   </ItemGroup>
 
-  <PropertyGroup Condition=" '$(TargetFramework)' == '$(NetFrameworkTestVersion)' ">
-    <DefineConstants>$(DefineConstants);</DefineConstants>
-  </PropertyGroup>
-
 </Project>

src/core/Akka.Streams.Tests.TCK/Akka.Streams.Tests.TCK.csproj

@@ -26,8 +26,4 @@
     <!--<PackageReference Include="NUnit" Version="3.7.1" Condition="'$(TargetFramework)' == '$(NetCoreTestVersion)'"/>-->
   </ItemGroup>
 
-  <PropertyGroup Condition=" '$(TargetFramework)' == '$(NetFrameworkTestVersion)' ">
-    <DefineConstants>$(DefineConstants)</DefineConstants>
-  </PropertyGroup>
-
 </Project>