Fix handling of attrs[:managed] on Org updates

This change resolves issue #3528 by preventing the updating of `@org.managed` when `attrs[:managed]` is missing.
Prior to this change, the `if attrs.key?(:managed)` was not present. But it was necessary, because that key is not present when a super user clicks "Save" on the "Request Feedback" page.
- As a result, if `attrs[:managed]` was not present,  then `attrs[:managed] = (attrs[:managed] == '1')` would evaluate false, and `if @org.update(attrs)` (line 81) would subsequently update `@org.managed` to false in the db.

Author: aaronskiba

app/controllers/orgs_controller.rb

@@ -44,7 +44,7 @@ def admin_update
     # Only allow super admins to change the org types and shib info
     if current_user.can_super_admin?
       identifiers = []
-      attrs[:managed] = attrs[:managed] == '1'
+      attrs = handle_managed_flag(attrs)
 
       # Handle Shibboleth identifier if that is enabled
       if Rails.configuration.x.shibboleth.use_filtered_discovery_service
@@ -236,6 +236,13 @@ def search_params
     params.require(:org).permit(:name, :type)
   end
 
+  def handle_managed_flag(attrs)
+    # NOTE: `:managed` is controlled by a check_box in the form
+    #   `app/views/orgs/_profile_form.html.erb`.
+    attrs[:managed] = (attrs[:managed] == '1') if attrs.key?(:managed)
+    attrs
+  end
+
   def shib_login_url
     shib_login = Rails.configuration.x.shibboleth.login_url
     "#{request.base_url.gsub('http:', 'https:')}#{shib_login}"