Remove EE-specific uses of `User#is_admin?`

app/controllers/projects/service_desk_controller.rb

@@ -24,6 +24,6 @@ class Projects::ServiceDeskController < Projects::ApplicationController
   end
 
   def authorize_admin_instance!
-    return render_404 unless current_user.is_admin?
+    return render_404 unless current_user.admin?
   end
 end

app/helpers/license_helper.rb

@@ -15,7 +15,7 @@ module LicenseHelper
   # in_html is set to false from an initializer, which shouldn't try to render
   # HTML links.
   #
-  def license_message(signed_in: signed_in?, is_admin: (current_user && current_user.is_admin?), in_html: true)
+  def license_message(signed_in: signed_in?, is_admin: (current_user && current_user.admin?), in_html: true)
     @license_message =
       if License.current
         yes_license_message(signed_in, is_admin)

app/models/ee/protected_branch_access.rb

@@ -45,7 +45,7 @@ module EE
     end
 
     def check_access(user)
-      return true if user.is_admin?
+      return true if user.admin?
       return user.id == self.user_id if self.user.present?
       return group.users.exists?(user.id) if self.group.present?
 

app/views/projects/edit.html.haml

@@ -135,7 +135,7 @@
             .js-service-desk-setting-root{ data: { endpoint: namespace_project_service_desk_path(@project.namespace, @project),
               enabled: @project.service_desk_enabled,
               incoming_email: (@project.service_desk_address if @project.service_desk_enabled),
-              is_instance_admin: current_user.is_admin? } }
+              is_instance_admin: current_user.admin? } }
 
         %hr
         %fieldset.features.append-bottom-default

lib/gitlab/git_access.rb

@@ -143,7 +143,7 @@ module Gitlab
       end
 
       if ::License.block_changes?
-        message = ::LicenseHelper.license_message(signed_in: true, is_admin: (user && user.is_admin?))
+        message = ::LicenseHelper.license_message(signed_in: true, is_admin: (user && user.admin?))
         raise UnauthorizedError, strip_tags(message)
       end