Reindex scenes after rescrape

[toshski]

If a scene is flagged as needs_update and the site re-scraped, the search index is not updated with changes to the scenes.

e.g. Baberotica has release titles initially with something like 'actor name 02' and then updated the title a few days later. If you flag these titles to re-scrape, the scene index still has the initial title.

The current process scans all scenes and if the index does not exist it adds it, but doesn't update. The change, builds a list of scenes return by the scrapers to the update channel, it will then remove an existing index data and add a new data.

Note: scraping using Options/Create/Import Scene/Scrape a scene to add/update a single scene, already works fine and is not affected by this change.