Update datacenter_overview.json (DataDog#23681)

delete 'pause_auto_refresh'

Author: kylerkang

snmp/assets/dashboards/datacenter_overview.json

@@ -4728,6 +4728,5 @@
   ],
   "layout_type": "ordered",
   "notify_list": [],
-  "pause_auto_refresh": false,
   "reflow_type": "fixed"
 }