Link_click events are being automatically excluded

[ansley-miller]

Following Snowplow's out of the box configuration documentation, Indicative was not receiving link_click events, but was receiving page_view and impression events. I triggered link_click a few times to be certain it was firing. After editing the Lambda function to explicitly exclude one of the unused atomic fields, Indicative started receiving link click events.
Link_click events aren't listed in unused events, but seems to be excluded by default.