[Settings] 1. Show default subId SIM page if get an intent with invalid

subId 2. Fix the hotswap UI issue

Bug: 271635200
Bug: 271347499
Test: local test
Change-Id: Iac61a211fce7bcd85da48cb291f46584cf43f5c5

src/com/android/settings/network/SubscriptionUtil.java

@@ -688,6 +688,12 @@ public class SubscriptionUtil {
                         .findFirst().orElse(null);
     }
 
+    public static boolean isDefaultSubscription(Context context, int subId) {
+        SubscriptionAnnotation subInfo = getDefaultSubscriptionSelection(
+                new SelectableSubscriptions(context, true).call());
+        return subInfo != null && subInfo.getSubscriptionId() == subId;
+    }
+
     public static SubscriptionInfo getSubscriptionOrDefault(Context context, int subscriptionId) {
         return getSubscription(context, subscriptionId,
                 (subscriptionId != SubscriptionManager.INVALID_SUBSCRIPTION_ID) ? null : (