Fix Ruby warnings in actionmailbox

```
rails/actionmailbox$ bundle exec rake tests
(snip)
...
rails/activerecord/lib/active_record/persistence.rb:48: warning: in `create!':
the last argument was passed as a single Hash
rails/actionmailbox/app/models/action_mailbox/inbound_email/message_id.rb:21:
warning: although a splat keyword arguments here
...
(snip)
```

1 files changed, 1 insertions, 1 deletions

diff --git a/actionmailbox/app/models/action_mailbox/inbound_email/message_id.rb b/actionmailbox/app/models/action_mailbox/inbound_email/message_id.rb
index 244a2e439b..2ad4525929 100644
--- a/actionmailbox/app/models/action_mailbox/inbound_email/message_id.rb
+++ b/actionmailbox/app/models/action_mailbox/inbound_email/message_id.rb
@@ -18,7 +18,7 @@ module ActionMailbox::InboundEmail::MessageId
     # attachment called `raw_email`. Before the upload, extract the Message-ID from the `source` and set
     # it as an attribute on the new `InboundEmail`.
     def create_and_extract_message_id!(source, **options)
-      create! message_id: extract_message_id(source), **options do |inbound_email|
+      create! options.merge(message_id: extract_message_id(source)) do |inbound_email|
         inbound_email.raw_email.attach io: StringIO.new(source), filename: "message.eml", content_type: "message/rfc822"
       end
     end