searchable: refactor searchable_includes.

Pass searchable associations directly to search_attributes instead of
defining them separately in searchable_includes.

app/models/note_version.rb

@@ -4,7 +4,7 @@ class NoteVersion < ApplicationRecord
   belongs_to_updater :counter_cache => "note_update_count"
 
   def self.search(params)
-    q = search_attributes(params, :id, :created_at, :updated_at, :is_active, :x, :y, :width, :height, :body, :version)
+    q = search_attributes(params, :id, :created_at, :updated_at, :is_active, :x, :y, :width, :height, :body, :version, :updater, :note, :post)
     q = q.text_attribute_matches(:body, params[:body_matches])
 
     q.apply_default_order(params)
@@ -69,10 +69,6 @@ class NoteVersion < ApplicationRecord
     end
   end
 
-  def self.searchable_includes
-    [:updater, :note, :post]
-  end
-
   def self.available_includes
     [:updater, :note, :post]
   end