Fix color corrector build references

Plugins/ColorCorrector/ColorCorrector.csproj

@@ -32,6 +32,7 @@
   <ItemGroup>
     <Reference Include="Assembly-CSharp">
       <HintPath>..\..\lib\Assembly-CSharp.dll</HintPath>
+      <Private>False</Private>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Core" />