FIX: Rename site setting in the database, too.

db/migrate/20190724200243_rename_staff_notes.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class RenameStaffNotes < ActiveRecord::Migration[5.2]
+  def change
+    execute "UPDATE site_settings SET name = 'user_notes_enabled' WHERE name = 'staff_notes_enabled'"
+  end
+end