Fixing hookgen csproj file so it works in visual studio builds

I was running into errors with building hookgen from visual studio. From what I read, Visual Studio only supports building code analyzers if it is targeting netstandard2.0. It didn't seem to have an effect in builds from command line, so changing it to allow better build workflow when working from VS.

Celeste64.HookGen/Celeste64.HookGen.csproj

@@ -1,6 +1,6 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <TargetFramework>net8.0</TargetFramework>
+        <TargetFramework>netstandard2.0</TargetFramework>
         <IsPackable>false</IsPackable>
         <Nullable>enable</Nullable>
         <LangVersion>latest</LangVersion>
@@ -17,9 +17,7 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.0"/>
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.3.0"/>
-
-        <PackageReference Include="MonoMod.RuntimeDetour" Version="25.1.0-prerelease.2"/>
+			<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.3.0"/>
+			<PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.3.0"/>
     </ItemGroup>
 </Project>