SensitivePn: Also hide international numbers

* When calling the number with intl. prefix it is currently not hidden
* Remove the international prefix before checking th number

Test:
Before:
116006 - hidden
+49116006 - not hidden
004911606 - not hidden

After:
116006 - hidden
+49116006 - hidden
0049116006 - hidden

Change-Id: I72ec2c9a4da87ef243c59c8c4bab33585fdbd854