Hide extra '0' when server has 0 player kills

The component shares rendering with Network as Numbers and player_kills is undefined on network.

Affects issues
- Fixed #3252

Plan/react/dashboard/src/components/cards/server/values/ServerAsNumbersCard.js

@@ -60,7 +60,7 @@ const ServerAsNumbersCard = ({data}) => {
                 <Datapoint name={t('html.label.sessions')}
                            color={'teal'} icon={faCalendarCheck}
                            value={data.sessions} bold/>
-                {data.player_kills && <hr/>}
+                {data.player_kills !== undefined && <hr/>}
                 <Datapoint name={t('html.label.playerKills')}
                            color={'red'} icon={faCrosshairs}
                            value={data.player_kills} bold/>