realm_playgrounds: Remove unnecessary Any for kwargs.

Having a more precise type annotation helps with ensuring the migration
to use URL templates gets type checked.

Signed-off-by: Zixuan James Li <p359101898@gmail.com>

zerver/openapi/curl_param_value_generators.py

@@ -302,12 +302,13 @@ def add_realm_playground() -> Dict[str, object]:
 
 @openapi_param_value_generator(["/realm/playgrounds/{playground_id}:delete"])
 def remove_realm_playground() -> Dict[str, object]:
-    playground_info = dict(
+    playground_id = do_add_realm_playground(
+        get_realm("zulip"),
+        acting_user=None,
         name="Python playground",
         pygments_language="Python",
         url_prefix="https://python.example.com",
     )
-    playground_id = do_add_realm_playground(get_realm("zulip"), acting_user=None, **playground_info)
     return {
         "playground_id": playground_id,
     }