Perf: Fix N+1 in kits#index (#5147)

Author: coalest

app/controllers/kits_controller.rb

@@ -1,6 +1,6 @@
 class KitsController < ApplicationController
   def index
-    @kits = current_organization.kits.includes(line_items: :item).class_filter(filter_params)
+    @kits = current_organization.kits.includes(:item, line_items: :item).class_filter(filter_params)
     @inventory = View::Inventory.new(current_organization.id)
     unless params[:include_inactive_items]
       @kits = @kits.active