Update ktn_code for the latest aleppo modifications

[jfacorro]

The location can also come as a tuple {Line, Column} now, so we need to update the ktn_code:get_location/1 function.

%% @private
get_location(Attrs) when is_integer(Attrs) ->
    Line = Attrs,
    {Line, 1};
get_location(Attrs) when is_list(Attrs) ->
    Line = proplists:get_value(line, Attrs, undefined),
    Column = proplists:get_value(column, Attrs, undefined),
    case {Line, Column} of
        {undefined, undefined} ->
            proplists:get_value(location, Attrs, {-1, -1});
        _ ->
            {Line, Column}
    end;
get_location(Location = {_Line, _Column}) -> %% This is the added clause
  Location;
get_location(_Attrs) ->
    {-1, -1}.