Fix adding a blocked number and return cause dialer to crash

+ BlockedListSearchFragment.onChangeFilteredNumberSuccess() calls
  activity.onBackPressed() instead of re-adding the management fragment.

Bug:25330660
Change-Id: If3a4cd26a180cf08a0e28f0c4bd05e7fd6149c20
diff --git a/src/com/android/dialer/list/BlockedListSearchFragment.java b/src/com/android/dialer/list/BlockedListSearchFragment.java
index 8fc6f7a..6ff7dda 100644
--- a/src/com/android/dialer/list/BlockedListSearchFragment.java
+++ b/src/com/android/dialer/list/BlockedListSearchFragment.java
@@ -15,9 +15,6 @@
  */
 package com.android.dialer.list;
 
-import android.content.ContentUris;
-import android.content.ContentValues;
-import android.net.Uri;
 import android.os.Bundle;
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatActivity;
@@ -31,7 +28,6 @@
 import android.widget.Toast;
 
 import com.android.contacts.common.GeoUtil;
-import com.android.contacts.common.dialog.IndeterminateProgressDialog;
 import com.android.contacts.common.list.ContactEntryListAdapter;
 import com.android.contacts.common.list.ContactListItemView;
 import com.android.dialer.R;
@@ -187,8 +183,7 @@
         if (activity == null) {
             return;
         }
-
-        activity.showManagementUi();
+        activity.onBackPressed();
     }
 
     @Override