Allow changing the case of name of an organisation only

src/Controller/OrganisationController.php

@@ -255,7 +255,7 @@ class OrganisationController extends SimpleController
         // Check if name or slug already exists
         if (
             isset($data['name']) &&
-            $data['name'] != $organisation->name &&
+            strtolower($data['name']) != strtolower($organisation->name) &&
             $classMapper->getClassMapping('organisation')::findUnique($data['name'], 'name')
         ) {
             $ms->addMessageTranslated('danger', 'ORGANISATION.NAME.IN_USE', $data);