修复sortAscendingByModificationDate设置为NO时的bug

TZImagePickerController/TZImagePickerController/TZPhotoPickerController.m

@@ -98,7 +98,7 @@ static CGFloat itemMargin = 5;
         [tzImagePickerVc showProgressHUD];
     }
     dispatch_async(dispatch_get_global_queue(0, 0), ^{
-        if (!tzImagePickerVc.sortAscendingByModificationDate && _isFirstAppear && iOS8Later) {
+        if (!tzImagePickerVc.sortAscendingByModificationDate && _isFirstAppear && iOS8Later && _model.isCameraRoll) {
             [[TZImageManager manager] getCameraRollAlbum:tzImagePickerVc.allowPickingVideo allowPickingImage:tzImagePickerVc.allowPickingImage needFetchAssets:YES completion:^(TZAlbumModel *model) {
                 _model = model;
                 _models = [NSMutableArray arrayWithArray:_model.models];