ISTWCMS-4791: add variable so theming knows what branding level was selected.
Sets up the required variable to test the changes in the matching branch from uw_wcms_gesso.
On or around 4:30pm on Thursday, January 16th, git.uwaterloo.ca will be restarted to apply a configuration change that may result in a brief service interruption.
Sets up the required variable to test the changes in the matching branch from uw_wcms_gesso.