Chore: Code Cleanup in API controllers (#932)

* Chore: Code Cleanup in API controllers

* Remove unnecessary scoping for accounts controller

app/controllers/api/base_controller.rb

@@ -11,10 +11,6 @@ class Api::BaseController < ApplicationController
     request.headers[:api_access_token].present? || request.headers[:HTTP_API_ACCESS_TOKEN].present?
   end
 
-  def set_conversation
-    @conversation ||= current_account.conversations.find_by(display_id: params[:conversation_id])
-  end
-
   def check_billing_enabled
     raise ActionController::RoutingError, 'Not Found' unless ENV['BILLING_ENABLED']
   end