Update desktop prod build output folder

ui/desktop/package.json

@@ -11,7 +11,7 @@
   },
   "scripts": {
     "doc:toc": "doctoc README.md",
-    "build": "ember build --environment=production && yarn build:desktop",
+    "build": "ember build --environment=production --output-path electron-app/ember-dist && yarn build:desktop",
     "build:development": "ember build",
     "build:desktop": "cd electron-app && yarn make",
     "lint": "npm-run-all --aggregate-output --continue-on-error --parallel lint:*",