Update webpack assets status checker to use server bundle configuration

Author: AbanoubGhadban

lib/react_on_rails/test_helper/webpack_assets_status_checker.rb

@@ -50,10 +50,8 @@ def stale_generated_files(files)
       def all_compiled_assets
         @all_compiled_assets ||= begin
           webpack_generated_files = @webpack_generated_files.map do |bundle_name|
-            if bundle_name == ReactOnRails.configuration.react_client_manifest_file
-              ReactOnRails::Utils.react_client_manifest_file_path
-            else
-              ReactOnRails::Utils.bundle_js_file_path(bundle_name)
+            if bundle_name == ReactOnRails.configuration.server_bundle_js_file
+              ReactOnRails::Utils.server_bundle_js_file_path
             end
           end