[Provider Model] Airplane mode slice design change

- Change title text:
  WiFi enabled: Turn off networks
  WiFi disabled: Turn on networks

- Add end icon with colorAccent

- The title text color changed is not included this CL.

- Screenshot
  https://screenshot.googleplex.com/44yYKphdem87UnU

Bug: 178719303
Test: manual test
atest -c AirplaneSafeNetworksSliceTest

Change-Id: I27ec111c3c9d4e228010b1495a9d0c7956ba5d74