Replace isSubscriptionEnabled with isActiveSubId.

As we don't allow pSIM modem disablment, we should simply use isActiveSubId
to decide whether a subscription's preferences is changable. This will
avoid potential modem bugs that reports wrong modem status that result
in Setting's UX error.

Bug: 135222940
Test: manual and robo
Change-Id: I7cccf2fdab7c89d26dac4daad51cd5d6f3a90eba

src/com/android/settings/network/telephony/DisabledSubscriptionController.java

@@ -72,7 +72,8 @@ public class DisabledSubscriptionController extends BasePreferenceController imp
         if (mCategory == null || mSubId ==  SubscriptionManager.INVALID_SUBSCRIPTION_ID) {
             return;
         }
-        mCategory.setVisible(mSubscriptionManager.isSubscriptionEnabled(mSubId));
+        // TODO b/135222940: re-evaluate whether to use mSubscriptionManager#isSubscriptionEnabled
+        mCategory.setVisible(mSubscriptionManager.isActiveSubId(mSubId));
     }
 
     @Override