Dialer : Add ability to delete from blacklist

Change-Id: I364cd26d178fb84eea314a2cd0d8f6ec23010857
Blacklist : Strip extension from number

Contacts with extensions in their numbers, fail to be blacklisted.
This resolves the issue.

Depends on : http://review.cyanogenmod.org/#/c/76298/1

Change-Id: I94f848e64972083ef8ddb728379953f788f418f3