fixed Test project path.

TestProjects/LWGraphicsTest/Packages/manifest.json

 {
     "dependencies": {
-        "com.unity.postprocessing": "file:../../../../com.unity.postprocessing", 
-        "com.unity.render-pipelines.core": "file:../../../../com.unity.render-pipelines.core",
-        "com.unity.shadergraph": "file:../../../../com.unity.shadergraph",
-        "com.unity.render-pipelines.lightweight": "file:../../../../com.unity.render-pipelines.lightweight"
+        "com.unity.postprocessing": "file:../../../com.unity.postprocessing", 
+        "com.unity.render-pipelines.core": "file:../../../com.unity.render-pipelines.core",
+        "com.unity.shadergraph": "file:../../../com.unity.shadergraph",
+        "com.unity.render-pipelines.lightweight": "file:../../../com.unity.render-pipelines.lightweight"
     }
 }