Use modern policy keys in this snippet

(cherry picked from commit 37b6203)

Author: michaelklishin

deps/rabbit/test/config_schema_SUITE_data/rabbit.snippets

@@ -200,18 +200,12 @@ ssl_options.fail_if_no_peer_cert = true",
   default_policies.operator.a.queue_pattern = apple
   default_policies.operator.a.vhost_pattern = banana
   default_policies.operator.a.apply_to = quorum_queues
-  default_policies.operator.a.classic_queues.ha_mode = exactly
-  default_policies.operator.a.classic_queues.ha_params = 2
-  default_policies.operator.a.classic_queues.ha_sync_mode = automatic
   default_policies.operator.a.classic_queues.queue_version = 2
 
  ",
   [{rabbit, [{default_policies, [{operator, [
       {<<"a">>, [{<<"apply_to">>,<<"quorum_queues">>},
                  {<<"expires">>, 3600000},
-                 {<<"ha_mode">>, <<"exactly">>},
-                 {<<"ha_params">>, 2},
-                 {<<"ha_sync_mode">>, <<"automatic">>},
                  {<<"queue_pattern">>, <<"apple">>},
                  {<<"queue_version">>, 2},
                  {<<"vhost_pattern">>, "banana"}]}]}]}]}],