IMS: Use the slot based ImsManager factory reset API.

Use the slot based factory reset API of ImsManager
to reset the IMS settings values for appropriate sub.

Test: Manual
Bug: 74412226
Change-Id: Iceabb225764ac01f0172142ef95e874ca93c061d
diff --git a/src/com/android/settings/ResetNetworkConfirm.java b/src/com/android/settings/ResetNetworkConfirm.java
index f70d3c2..7131e94 100644
--- a/src/com/android/settings/ResetNetworkConfirm.java
+++ b/src/com/android/settings/ResetNetworkConfirm.java
@@ -105,7 +105,8 @@
                 }
             }
 
-            ImsManager.factoryReset(context);
+            ImsManager.getInstance(context,
+                     SubscriptionManager.getPhoneId(mSubId)).factoryReset();
             restoreDefaultApn(context);
 
             Toast.makeText(context, R.string.reset_network_complete_toast, Toast.LENGTH_SHORT)