Alias the lfs_enabled method

We currently check for `project.lfs_enabled` to display
the state of lfs being enabled/disabled, but this is set to nil by
default, even when lfs is enabled.

Aliasing the method to #lfs_enabled? will return the correct state.

app/models/project.rb

@@ -548,6 +548,8 @@ class Project < ActiveRecord::Base
     self[:lfs_enabled] && Gitlab.config.lfs.enabled
   end
 
+  alias_method :lfs_enabled, :lfs_enabled?
+
   def auto_devops_enabled?
     if auto_devops&.enabled.nil?
       has_auto_devops_implicitly_enabled?

changelogs/unreleased/lfs-project-attribute-alias.yml

+---
+title: Resolve LFS not correctly showing enabled
+merge_request: 22501
+author:
+type: fixed

spec/lib/gitlab/import_export/project_tree_restorer_spec.rb

@@ -335,7 +335,7 @@ describe Gitlab::ImportExport::ProjectTreeRestorer do
 
         restored_project_json
 
-        expect(project.lfs_enabled).to be_nil
+        expect(project.lfs_enabled).to be_falsey
       end
     end