Fix ImeiInfoPreferenceControllerTest

For test case updatePreference_simSlotWithoutSim_notSetEnabled,
mSecondSimPreference is a mock, instead of check the default value of
isEnabled(), verify it's setEnabled() not called.

Fix: 279880808
Test: RobolectricTest
Change-Id: I72064820754e053def46bdbf10317189c7ac608f

src/com/android/settings/deviceinfo/imei/ImeiInfoPreferenceController.java

@@ -150,7 +150,6 @@ public class ImeiInfoPreferenceController extends BasePreferenceController {
 
     @VisibleForTesting
     protected void updatePreference(Preference preference, int simSlot) {
-        SubscriptionInfo subInfo = getSubscriptionInfo(simSlot);
         preference.setTitle(getTitle(simSlot));
         preference.setSummary(getSummary());
     }