Notify adapter that data changed

Signed-off-by: Mario Danic <mario@lovelyhq.com>

src/main/java/com/owncloud/android/ui/activity/FolderSyncActivity.java

@@ -562,11 +562,9 @@ public class FolderSyncActivity extends FileActivity implements FolderSyncAdapte
 
     @Override
     public void onDeleteSyncedFolderPreference(SyncedFolderParcelable syncedFolder) {
-        // TODO refresh recycler view
-
         mSyncedFolderProvider.deleteSyncedFolder(syncedFolder.getId());
-
         mAdapter.removeItem(syncedFolder.getSection());
+        mAdapter.notifyDataSetChanged();
     }
 
     /**