Remove unnecessary includes in aggregate template code

[woutd]

Got an include error with Cacti 1.2.0:
2019/01/04 10:14:47 - ERROR PHP WARNING: include_once(/XXX/cacti-1.2.0/api_aggregate.php): failed to open stream: No such file or directory in file: /XXX/cacti-1.2.0/aggregate_templates.php on line: 259

The line reads:
include_once($config['base_path'] . '/api_aggregate.php');

I think this should be:
include_once($config['base_path'] . '/lib/api_aggregate.php');

[cigamit]

Resolved.