fixed typo in rtdb get node and added auto setup for firestore and rtdb get

package.json

@@ -1,6 +1,6 @@
 {
   "name": "node-red-contrib-firebase-admin",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "description": "A node-red module that wraps the server-side  admin SDK of firebase, firestore, et.c.",
   "main": "index.js",
   "scripts": {

rtdb/rtdb-get.js

@@ -47,7 +47,7 @@ module.exports = function(RED) {
       }
     }.bind(this));
 
-    setUpListener(path)
+    setUpListener(this.path)
 
   }
   RED.nodes.registerType("rtdb-get", FirebaseAdmin);