Fixing the RemoteConfig main entry (#2229)

Was referencing a non-existent `dist/index.node.cjs.js`, fixed.

Author: jamesdaniels

packages/remote-config/package.json

@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "description": "The Remote Config package of the Firebase JS SDK",
   "author": "Firebase <[email protected]> (https://firebase.google.com/)",
-  "main": "dist/index.node.cjs.js",
+  "main": "dist/index.cjs.js",
   "browser": "dist/index.cjs.js",
   "module": "dist/index.esm.js",
   "esm2017": "dist/index.esm2017.js",