Cacti polling and boost report the wrong number of Data Sources when Devices are disabled

[TheWitness]

Describe the bug

Cacti polling reports the incorrect number of poller item's in both main polling and from a boost perspective when devices are disabled.

To Reproduce

Steps to reproduce the behavior:

1. Create thousands of Devices and Graphs

2. Disable these Devices

3. Notice that on the next poller run that the Data Source count does not go down.

Expected behavior

Better reporting.