Use onUserDataEnabledChanged to set DDS

With the introduction of auto data switch, onUserDataEnabledChanged no longer necessarily triggers onDataEnabledChanged, so listen to onUserDataEnabledChanged instead in order to always get the user data enabled change event.

Fix: 287567971
Test: manual reproduce and verify
Change-Id: I79fccc1fa2677e755a3987d93599ad7ca2b29067