Fix wrong PreferenceCategory for SMS delivery report

Test: Manual

Change-Id: I3008c596e5559e51613ed2da43793187c79381f5
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>
diff --git a/src/com/android/messaging/ui/appsettings/PerSubscriptionSettingsActivity.java b/src/com/android/messaging/ui/appsettings/PerSubscriptionSettingsActivity.java
index 623bc91..7ab5dc7 100644
--- a/src/com/android/messaging/ui/appsettings/PerSubscriptionSettingsActivity.java
+++ b/src/com/android/messaging/ui/appsettings/PerSubscriptionSettingsActivity.java
@@ -134,7 +134,7 @@
             if (!MmsConfig.get(mSubId).getSMSDeliveryReportsEnabled()) {
                 final Preference deliveryReportsPref = findPreference(
                         getString(R.string.delivery_reports_pref_key));
-                mmsCategory.removePreference(deliveryReportsPref);
+                advancedCategory.removePreference(deliveryReportsPref);
             }
             final Preference wirelessAlertPref = findPreference(getString(
                     R.string.wireless_alerts_key));