Fix npm set commands in devcontainer configuration

Author: hubwriter

.devcontainer/devcontainer.json

@@ -63,8 +63,8 @@
   "postStartCommand": "nohup bash -c 'npm start &'",
   // Set the port to be public
   "postAttachCommand": [
-    "npm set \"//npm.pkg.github.com/:_authToken=$GITHUB_TOKEN\"",
-    "npm set \"@github:registry=https://npm.pkg.github.com/\"",
+    "npm set //npm.pkg.github.com/:_authToken=$GITHUB_TOKEN",
+    "npm set @github:registry=https://npm.pkg.github.com/",
     "npm install -g @github/copilot",
     "gh cs ports visibility 4000:public -c \"$CODESPACE_NAME\""
   ],