Clear invalid SIM slot data when INVALID SUBSCRIPTION received

SysUI has historically indexed by subscriptionId. In this case,
a valid subscription id, followed by an invalid id, followed again
by a valid subscription id, failed to send an update as both
pieces of information were kept for the same slotId. Only 1
entry per slotId should exist.

Fixes: 368163390
Test: atest KeyguardUpdateMonitorTest
Flag: EXEMPT bugfix
Change-Id: I35cd3abde77fb4dc940aa39b3c456735d0e2eee6