Only tearing down restricted metered data when data is enabled

Reverted the behavior introduced in ag/2091549 that causes
restricted unmetered IMS data connection disconnected.

Test: Manual
bug: 63279719
Merged-In: I03e19cb66f29e8b0f06e66ff64d64575b9345a47
Change-Id: I03e19cb66f29e8b0f06e66ff64d64575b9345a47