Fix the bug of "Connecting" is rarely appearing on Wi-Fi slice

- AccessPoint treats connected and connecting as equal so slice doesn't
refresh in this case
- Add a new method to determine if two lists are the same in SliceBackgroundWorker
- WifiScanWorker overrides this method to check the access point states

Fixes: 123941320
Test: robotest
Change-Id: I78d610da4b6b1d40f5785ba6701fb71b987fe31c