remove removed file from build config

Tools/Gulp/config.json

@@ -841,7 +841,6 @@
         "renderingPipeline": {
             "files": [
                 "../../src/PostProcess/RenderPipeline/babylon.postProcessRenderPipelineManager.js",
-                "../../src/PostProcess/RenderPipeline/babylon.postProcessRenderPass.js",
                 "../../src/PostProcess/RenderPipeline/babylon.postProcessRenderEffect.js",
                 "../../src/PostProcess/RenderPipeline/babylon.postProcessRenderPipeline.js"
             ],