fix: correct typo in CampaignConversationBuilder (#11336)

## Description

Fixed a typo in the `CampaignConversationBuilder` class.

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?

Verified that the typo fix does not affect functionality by running the
existing test suite.

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] My changes generate no new warnings
- [x] New and existing unit tests pass locally with my changes

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>

app/builders/campaigns/campaign_conversation_builder.rb

@@ -9,7 +9,7 @@ class Campaigns::CampaignConversationBuilder
       @contact_inbox.lock!
 
       # We won't send campaigns if a conversation is already present
-      raise 'Conversation alread present' if @contact_inbox.reload.conversations.present?
+      raise 'Conversation already present' if @contact_inbox.reload.conversations.present?
 
       @conversation = ::Conversation.create!(conversation_params)
       Messages::MessageBuilder.new(@campaign.sender, @conversation, message_params).perform