Fixed two icons shown after switching to single SIM

Fixed that subscription database not correctly initialized
after switching from dual SIM mode to single SIM mode.

Test: adb shell setprop persist.radio.multisim.config ssss && adb reboot
Test: Basic telephony functionality tests
Test: atest SubscriptionManagerServiceTest
Fix: 296190125
Fix: 289881824
Change-Id: I60aa5b7447d78dd927ac05acc78a9af9abae416e