Ignore trailing whitespace in proto-loader golden file test diff

Author: murgatroid99

packages/proto-loader/package.json

@@ -25,7 +25,7 @@
     "pretest": "npm run compile",
     "posttest": "npm run check",
     "generate-golden": "node ./build/bin/proto-loader-gen-types.js --keepCase --longs=String --enums=String --defaults --oneofs --json --includeComments -I deps/gapic-showcase/schema/ deps/googleapis/ -O ./golden-generated --grpcLib @grpc/grpc-js google/showcase/v1beta1/echo.proto",
-    "validate-golden": "rm -rf ./golden-generated-old && mv ./golden-generated/ ./golden-generated-old && npm run generate-golden && diff -r ./golden-generated ./golden-generated-old"
+    "validate-golden": "rm -rf ./golden-generated-old && mv ./golden-generated/ ./golden-generated-old && npm run generate-golden && diff -rZ ./golden-generated ./golden-generated-old"
   },
   "repository": {
     "type": "git",