Remove #active? from License model

Remove the #active? method from the License model to avoid confusion
between the terms of current and active license.

ee/app/models/license.rb

@@ -416,10 +416,6 @@ class License < ApplicationRecord
     restricted_attr(:trial)
   end
 
-  def active?
-    !expired?
-  end
-
   def exclude_guests_from_active_count?
     plan == License::ULTIMATE_PLAN
   end

ee/app/views/admin/licenses/show.html.haml

@@ -42,7 +42,7 @@
                 Expired:
               - else
                 Expires:
-            - if @license.will_expire? && @license.active?
+            - if @license.will_expire? && !@license.expired?
               - if @license.trial?
                 %strong.has-tooltip{ title: @license.expires_at.to_formatted_s(:long), data: { placement: 'top' } }
                   Free trial will expire in #{pluralize(@license.remaining_days, 'day')}