Let the bus tools remove the controller's leftovers by one word

The controller ended by its unassignment, so its consumers, streams and
buckets may be removed as recorded hand acts (ADR 0590 §6). The nats tools'
account declares controller-leftovers in place of the lease write's two
words, and the removal test proves a consumer of EVENTS and a bucket's
stream go while EVENTS and its other consumers stay (issue 1126 B5).

Claude-Session: https://claude.ai/code/session_01NcbgfJ9Gum47zkFKWRaovL

modules/nats/module.json

@@ -215,8 +215,7 @@
         ],
         "bus": {
           "removes": [
-            "DEAD_LETTER_NOTICES.controller",
-            "ASSIGNMENTS"
+            "controller-leftovers"
           ]
         },
         "env": {