Fix ArgumentError when loading newer Private Mentions (#25399)

app/controllers/api/v1/conversations_controller.rb

@@ -45,7 +45,7 @@ class Api::V1::ConversationsController < Api::BaseController
                            },
                          ]
                        )
-                       .to_a_paginated_by_id(limit_param(LIMIT), **params_slice(:max_id, :since_id, :min_id))
+                       .to_a_paginated_by_id(limit_param(LIMIT), params_slice(:max_id, :since_id, :min_id))
   end
 
   def insert_pagination_headers