VID-1787 - Add genres to page categories for Howdini videos

Just a note, this is kind of a terrible function as it uses multiple LIKEs to match the metadata blob.  Given this is a maintenance script that is only running against ~200K records its probably fine.  The only real alternative I know right now is to just write the SQL yourself against the video_info table.  The reason that function does what it does is either because it was written before the video_info table was created or because someone didn't trust video_info.