Fix .rubocop.yml inherit_from paths for new structure

After the monorepo restructure, .rubocop.yml files in react_on_rails/ subdirectories
were using inherit_from paths that pointed to non-existent parent configs.

Fixed paths:
- react_on_rails/spec/dummy/.rubocop.yml: ../../.rubocop.yml → ../../../.rubocop.yml
- react_on_rails/spec/react_on_rails/.rubocop.yml: ../../.rubocop.yml → ../../../.rubocop.yml

Both files now correctly inherit from the root .rubocop.yml at the monorepo root.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: justin808

react_on_rails/spec/dummy/.rubocop.yml

@@ -1,5 +1,5 @@
 inherit_from:
-  - ../../.rubocop.yml
+  - ../../../.rubocop.yml
 
 AllCops:
   Exclude:

react_on_rails/spec/react_on_rails/.rubocop.yml

@@ -1,5 +1,5 @@
 inherit_from:
-  - ../../.rubocop.yml
+  - ../../../.rubocop.yml
 
 Metrics/BlockLength:
   Max: 145