Hide additional blacklist separator

When there is no blacklist func enabled we dont need
2 separators at the end of row

Change-Id: Ieef2d2b5f553c2b4dd48ae528e7a0de185f4b2ad
phone: Set default preference values for blacklist option

Change-Id: Iac33c84e19f30dd78226989977af90891d65018a
Make contacts app aware of blacklist setting (2/3)

Also fix up notify option key while we're at changing the user's
settings ;-)

Change-Id: I51069235693ee9fd055d11e62f8f152ff7bc0210