Update firestore.rules

Updating Rules to be correct (`resource.data.property`)

Author: asciimike

firestore/firestore.rules

@@ -3,16 +3,16 @@ service cloud.firestore {
     match /restaurants/{restaurant} {
       match /ratings/{rating} {
         allow read: if request.auth != null;
-        allow write: if request.auth.uid == request.resource.userId;
+        allow write: if request.auth.uid == request.resource.data.userId;
       }
 
       allow read: if request.auth != null;
       allow create: if request.auth != null;
       allow update: if request.auth != null
-                    && request.resource.name == resource.name
-                    && request.resource.city == resource.city
-                    && request.resource.price == resource.price
-                    && request.resource.category == resource.category;
+                    && request.resource.data.name == resource.data.name
+                    && request.resource.data.city == resource.data.city
+                    && request.resource.data.price == resource.data.price
+                    && request.resource.data.category == resource.data.category;
     }
   }
 }