Fix bug when assets group changed, the asset filter is not re-applied #77
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If I set the assets filter to be all photos, I can open the picker and see all photos shown. If I go to the Photos app and make some changes (like delete a photo), when I come back to the picker, I can see the collection reloaded with the photo removed. However, this time I will also see videos as well.
This is because the asset groups are also reloaded on ALAssetsLibraryChangedNotification but the assets filter is not re-applied in updateAssetsGroupForURL: and insertAssetsGroupForURL: