Fix RuboCop line length violation in react_on_rails.rb

Break build_production_command assignment across two lines to satisfy
the 120 character max line length requirement.

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

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

Author: justin808

config/initializers/react_on_rails.rb

@@ -8,7 +8,8 @@
 
   # Build commands with locale generation
   config.build_test_command = "RAILS_ENV=test bin/shakapacker"
-  config.build_production_command = "bundle exec rake react_on_rails:locale && RAILS_ENV=production NODE_ENV=production bin/shakapacker"
+  config.build_production_command =
+    "bundle exec rake react_on_rails:locale && RAILS_ENV=production NODE_ENV=production bin/shakapacker"
 
   # This is the file used for server rendering of React when using `(prerender: true)`
   # If you are never using server rendering, you may set this to "".