fix(specs): wrong ACL for getSettings (#4933)

Author: kai687

specs/search/paths/settings/settings.yml

@@ -4,7 +4,7 @@ get:
   operationId: getSettings
   x-mcp-tool: true
   x-acl:
-    - search
+    - settings
   description: Retrieves an object with non-null index settings.
   summary: Retrieve index settings
   parameters: