Rubocop fixes

Author: rsmithlal

app/controllers/better_together/platform_invitations_controller.rb

@@ -126,7 +126,7 @@ def param_invitation_class
 
       Rails.application.eager_load! if Rails.env.development? # Ensure all models are loaded
       valid_types = [BetterTogether::PlatformInvitation, *BetterTogether::PlatformInvitation.descendants]
-      valid_types.find { |klass| klass.to_s === param_type }
+      valid_types.find { |klass| klass.to_s == param_type }
     end
   end
   # rubocop:enable Metrics/ClassLength