Shovel bugfix: use 'last_acked_tag' to keep track of acked/nacked messages

(cherry picked from commit 0c4ec95)

Author: dcorbacho

deps/rabbitmq_shovel/src/rabbit_amqp10_shovel.erl

@@ -307,12 +307,12 @@ ack(Tag, false, State = #{source := #{current := #{link := LinkRef}} = Src}) ->
 nack(Tag, false, State = #{source := #{current := #{link := LinkRef}} = Src}) ->
     % the tag is the same as the deliveryid
     ok = amqp10_client_session:disposition(LinkRef, Tag, Tag, true, rejected),
-    State#{source => Src#{last_nacked_tag => Tag}};
+    State#{source => Src#{last_acked_tag => Tag}};
 nack(Tag, true, State = #{source := #{current := #{link := LinkRef},
-                                      last_nacked_tag := LastTag} = Src}) ->
+                                      last_acked_tag := LastTag} = Src}) ->
     First = LastTag + 1,
     ok = amqp10_client_session:disposition(LinkRef, First, Tag, true, rejected),
-    State#{source => Src#{last_nacked_tag => Tag}}.
+    State#{source => Src#{last_acked_tag => Tag}}.
 
 status(#{dest := #{current := #{link_state := attached}}}) ->
     flow;