Fix performer tags not applying on scene scrapers

[Releck]

Given a scraper such as

name: Tester
sceneByFragment:
  action: scrapeXPath
  queryURL: https://stashapp.cc/
  scraper: sceneScraper
xPathScrapers:
  sceneScraper:
    scene:
      Title: //meta[@property='og:site_name']/@content
      Performers:
        Name:
          fixed: Performer
        Tags:
          Name:
            fixed: example

The tag "example" would be applied to the scene and not the performer. This PR fixes that behaviour so the tag is applied on the performer instead as galleries do.