Fix read_contract_getter/4

This was meant to be a placeholder that I would catch and fix, but my test case never hit it! Whoops.

src/hz.erl

@@ -790,8 +790,7 @@ decode_bytearray2(FATE, {erlang, Type}) -> hz_aaci:fate_to_erlang(Type, FATE).
 
 read_contract_getter(AACI, ConID, Fun, Args) ->
     case contract(ConID) of
-        {ok, {}} ->
+        {ok, #{"owner_id" := CallerID}} ->
-            CallerID = ConID,
             read_contract_getter(CallerID, AACI, ConID, Fun, Args);
         {error, Reason} ->
             {error, Reason}