Drilldown field don't save values on POST

[DarkSide666]

atk4-addons / misc / lib / Form / Field / drilldown.php

Line 52 should be changed from

return $res+$this->drill($m);

to

return $this->value_list = $res+$this->drill($m);

otherwise $this->value_list don't get correct values set and field validation gives and error.

[DarkSide666]

Fixed with this: #12