housekeeping: Fix test targets

Author: glennawatson

src/ReactiveUI.AOTTests/ReactiveUI.AOT.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net9.0</TargetFramework>
+    <TargetFrameworks>$(ReactiveUITestTargets)</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <IsPackable>false</IsPackable>

src/ReactiveUI.Builder.WpfApp/ReactiveUI.Builder.WpfApp.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk" Condition="'$(IsWindows)' == 'true'">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>WinExe</OutputType>

src/ReactiveUI.Splat.Tests/ReactiveUI.Splat.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(ReactiveUIFinalModernTargetFrameworks)</TargetFrameworks>
+    <TargetFrameworks>$(ReactiveUITestTargets)</TargetFrameworks>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
   <ItemGroup>

src/ReactiveUI.Testing.Tests/ReactiveUI.Testing.Tests.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>$(ReactiveUIFinalModernTargetFrameworks)</TargetFrameworks>
+    <TargetFrameworks>$(ReactiveUITestTargets)</TargetFrameworks>
     <FodyTargetFramework>netstandard2.0</FodyTargetFramework>
     <FodyTargetFramework Condition=" $(TargetFramework.StartsWith('net4')) ">$(TargetFramework)</FodyTargetFramework>
   </PropertyGroup>