Address code review comments

Author: zzooeeyy

test/test_helper.rb

@@ -87,8 +87,7 @@ def modify_context(
           log_level: :off,
           response_as_struct: response_as_struct || ShopifyAPI::Context.response_as_struct,
           api_host: api_host || ShopifyAPI::Context.api_host,
-          expiring_offline_access_tokens:
-            expiring_offline_access_tokens || ShopifyAPI::Context.expiring_offline_access_tokens,
+          expiring_offline_access_tokens: !expiring_offline_access_tokens.nil? ? expiring_offline_access_tokens : ShopifyAPI::Context.expiring_offline_access_tokens,
         )
       end
     end