Change excepted result for getLine1NumberForSubscriber

If SIM2 uicc application is off, SIM2 getLine1Number() may return
SIM1(phone 0)‘s number because it replace with phone 0 to
getLine1Number() for invalid phone id in PhoneSubInfoController.java.
Solution is to revise getPhone() in PhoneSubInfoController.java,
don't return phone 0 for invalid phone slot index.

Bug: 168663871
Test: manual verify pass
Change-Id: I9c7bdcd7bed73df1363a1ed831ab6d36d0bea9d3