Clear apids on disable and only add me if user list is empty

lib/global-admin/addon/components/site-access/component.js

@@ -104,7 +104,7 @@ export default Component.extend({
         }
       });
 
-      if ( !found ) {
+      if ( !found && !allowedPrincipals.length) {
         allowedPrincipals.pushObject(get(this, 'access.principal.id'));
       }
     }

lib/global-admin/addon/mixins/authentication.js

@@ -70,7 +70,8 @@ export default Mixin.create({
 
       setProperties(model, {
         enabled:  false,
-        accessMode: 'unrestricted'
+        accessMode: 'unrestricted',
+        allowedPrincipalIds: []
       });
 
       model.doAction('disable').then(() => {