package.json: also clean the service build dir

Author: throwaway96

package.json

@@ -10,7 +10,7 @@
     "package": "ares-package dist/ -e enyo-ilib",
     "deploy": "ares-install org.webosbrew.hyperion.ng.loader_${npm_package_version}_all.ipk",
     "launch": "ares-launch org.webosbrew.hyperion.ng.loader",
-    "clean": "rm -rf dist/",
+    "clean": "rm -rf dist/ service/build/",
     "lint": "eslint .",
     "build-local": "npm-run-all --serial build-local:**",
     "build-local:frontend": "enyo pack",