SensitivePhoneNumbers: Additionally check against the sim operator

* In order to also mark numbers as sensitive when calling to your home
  country, check the sim's operator as well
* Also move the fallback mechanism out of the "else" in order to perform
  as many checks as possible to not miss any case of hiding

Change-Id: I23b67145406793506be657df8b62f5d09b5a2a18