Use user WFC setting instead of checking WFC service status

Check if WFC has been enabled by user instead of checking if
IMS over wifi is enabled. This covers the case of VT offload,
where user has disabled WFC but call is on wifi.

Test: Manual
Bug: 38459634
Merged-In: I60d6960b5ac028f48726e47d387cd561caecb9aa
Change-Id: I60d6960b5ac028f48726e47d387cd561caecb9aa
(cherry picked from commit 5a34ea741ae87778d1e1cf5629abcc3a957eae79)
1 file changed