Fixed that remote SIM can't be inserted correctly

The slot index should be ignored if the subscription type
is remote SIM. Note that for now we use -1 as the SIM slot index
for remote SIM. This needs to be revisited if we plan to support
multiple remote SIMs in the future.

Fix: 381917651
Test: Manual
Test: atest SubscriptionManagerServiceTest
Flag: EXEMPT bug fix
Change-Id: I9e9b9e4b6d6686594dc947513c5b83dbf33c0583