fix: fix a project reference mistake

Author: Wanglongzhi2001

test/TensorFlow.Kernel.UnitTest/TensorFlow.Kernel.UnitTest.csproj

@@ -17,8 +17,8 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\..\src\TensorFlowNET.Keras\Tensorflow.Keras.csproj" />
     <ProjectReference Include="..\..\tools\Tensorflow.UnitTest.RedistHolder\Tensorflow.UnitTest.RedistHolder.csproj" />
-    <ProjectReference Include="..\TensorFlowNET.Keras.UnitTest\Tensorflow.Keras.UnitTest.csproj" />
   </ItemGroup>
 
 </Project>