fix(group-attributes): log metric when post_save.send(update_fields=["status", "subs"]) is called for group (#52996)

Was looking at the incorrect kwargs key when `post_save.send()` was
called.

Author: barkbarkimashark

src/sentry/issues/attributes.py

@@ -41,7 +41,7 @@ def post_save_log_group_attributes_changed(instance, sender, created, *args, **k
         if created:
             _log_group_attributes_changed(Operation.CREATED, "group", None)
         else:
-            if "updated_fields" in kwargs:
+            if "update_fields" in kwargs:
                 update_fields = kwargs["update_fields"]
                 # we have no guarantees update_fields is used everywhere save() is called
                 # we'll need to assume any of the attributes are updated in that case