Fix indenting in SQLite database.yml

Author: ghiculescu

railties/lib/rails/generators/rails/app/templates/config/databases/sqlite3.yml.tt

@@ -29,4 +29,4 @@ test:
 # ensure the database is located in a persisted volume.
 production:
   <<: *default
-# database: path/to/persistent/storage/production.sqlite3
+  # database: path/to/persistent/storage/production.sqlite3